Answers
The experimental percent yield of water in the hydrate is 61.67% and percent error is 38.33%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In the given problem percent yield of water in the hydrate is 22/35.67×100= 61.67%.Thus, percent error = 100-61.67= 38.33%.
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Related Questions
Upon solvation, energy is always: Select the correct answer below: O absorbed O released O constant O depends on the solution
Answers
Upon solvation, energy is always released. Correct answer: letter B.
This is because the energy required to break the bonds between the solvent molecules and the solute molecules is greater than the energy released when the solute molecules form new bonds with the solvent molecules.
The amount of energy released or absorbed during solvation is dependent on the type of solute and solvent, and the concentration of the solution.
In addition to the energy released or absorbed during solvation, the process also affects the thermodynamic properties of the solution. Generally, the entropy of a solution increases upon solvation due to the increased number of molecules and the increased number of possible states.
This leads to a decrease in the solution's temperature, as energy is released in the form of heat.
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A system has reached chemical equilibrium: Which is true of the system? -there is no net. change in the concentration of reactants or products -the molecules have stopped combining and decomposing -the system is open there is no change taking place-All of the above are true
Answers
Neither the reactant nor product concentrations change overall. -The molecules are no longer fusing together or breaking down.
The amount of solute (the material being dissolved) per unit volume of solvent is known as the concentration of a substance in a solution (the substance in which the solute is dissolved). Using measures like molarity, molality, and mole fraction, concentration is a measurement of the amount of solute in a solution.The rate of a reaction and the final result of a chemical reaction can both be significantly impacted by variations in the concentration of the reactants and products. Understanding concentration is crucial for comprehending how solutions behave and how chemical reactions turn out. Additionally, adjustments to concentration can be made to regulate the rate of reactions, for as by varying the quantity of reactants added.
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Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. A solution of caffeine in the solvent chloroform (CHCl3) has a concentration of 0.0520 m.
Part A:
Calculate the percentage of caffeine by mass in the solution.
Part B:
Calculate the mole fraction of caffeine in the solution.
Answers
Taking into account molality, percentage by mass, and mole fraction. The solution's proportion by mass is 0.952%. The solution contains 0.00587 moles of caffeine.
Is the stimulant present in coffee and tea called caffeine?The chemical caffeine stimulates (increases activity in) the brain and nervous system. Coffee, tea, soft drinks, and energy drinks are just a few beverages that contain caffeine. Caffeine can be found in chocolate. Oftentimes, energy drinks have more sugar and caffeine than soft beverages.
% by mass is equal to (mass of solute/mass of solution) * 100.
Regarding this:
caffeine, whose molar mass is 194.22g/mol, has a mass of 0.0490 moles (194.22g/mol) per 1 kilogramme of solution, or 0.00952 kg.
Then, the percentage by mass is calculated as:
Percentage by mass = (0.00952kg/ 1kg)*100
Solving:
Percentage by mass= 0.952%
The percentage by mass of the solution is 0.952%.
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which of the following options correctly describe how to calculate a molecular or formula mass for a compound? select all that apply.
Answers
Cations and anions have atomic masses that are almost identical to those of neutral elements. Ca(NO3)2 is an example of a formula. The formula/molecular mass is determined by adding the masses of the constituent elements in the right ratios.
How are the molecular mass and formula calculated?
By applying the relevant compound's chemical formula and atomic masses learned from the periodic table. The compound's formula or molecular mass is determined by adding the atomic masses in the right ratios. Which of the following statements best encapsulates the proper way to name a binary covalent compound? - With its roots and the prefix -ide, the second element is given a name.
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CAN SOMEONE HELP WITH THIS QUESTION?✨
Answers
Answer:
17.03 cm^3
Explanation:
V=π r ^2 h
= π · (1.02)^2 · 5.21
≈17.03 cm^3
(Radius is 1.02 b/c the question gave us diameter which is 2 times the value of radius so to get to radius we just divide diameter by 2)
the aromatic region 7-8 ppm of the proton NMR spectrum of compounds with para disubstituted benzene rings such as phenacetin is often referred to as an AB pattern. this pattern has two doublet signals coupled to each other. explain the origin of this AB pattern
Answers
Because there are two mutually connected nuclei in aromatic ring of phenacetin that are not related to other protons and whose shift differences are equal to coupling constant, ring displays AB pattern.
Why do protons exist on benzene deshielded?The ring protons in benzene experience deshielding because their chemical shift is 7.3 parts per million (ppm) as opposed to 5.6 for the vinylic proton in cyclohexene, and because the induced magnetic field outside the ring has the same direction as the external field.
What frequency range does proton NMR show benzene protons?Around 6–8 ppm of benzene contains protons. Due to the deshielding action of the aromatic ring, this is higher than the protons in other hydrocarbons like alkanes and alkenes.
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Answer:Due to the presence of two mutually connected nuclei and a shift difference equal to the coupling constant, the aromatic ring of phenacetin exhibits the AB pattern.
Explanation:
Question Which statement best describes the relationship between changes in air pressure and wind speeds? Responses When a high- and a low-pressure air mass are far apart, air moves quickly from high to low pressure. When a high- and a low-pressure air mass are far apart, air moves quickly from high to low pressure. When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure. When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure. When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure.
Answers
The statement which best describes the air pressure and wind speed is option c is correct. When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure.
What are winds?Winds are passage of air from high pressure area to low pressure area. Air masses may travel from one place to another as a result of variations in air pressure. Air masses often move from high-pressure regions to low-pressure regions.
Winds therefore sweep away from high-pressure zones and toward low-pressure ones. The winds can moves the air masses in the atmosphere and the air masses collide in the clod and humid air.
Winds transfer meteorological conditions from the source location to the destination zone as they move air masses. The air mass may collide with another air mass that has a different temperature and humidity as it enters a new area. This may bring about a powerful storm.
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: Balance the following equations:
Nal +
F₂ —>
NaF +
+
I₂
Answers
The balanced equation of the given reaction is given below:
2 NaI + F₂ -----> 2 NaF + I₂What is a balanced equation of a chemical reaction?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same total charge and the same number of atoms for each component in the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.
Numerical coefficients are placed in the front of the formula of the compound and elements until the mole of atoms is balanced on both sides of the equation.
The balanced equation of the given reaction is obtained by placing 2 in front of NaI and NaF.
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3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O In the above equation how many moles of water can be made when 103.5 grams of HNO3 are consumed?
Answers
Taking into account the reaction stoichiometry, 0.82 moles of water can be made when 103.5 grams of HNO₃ are consumed.
Reaction stoichiometryIn first place, the balanced reaction is:
3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Cu: 3 molesHNO₃: 8 molesCu(NO₃)₂: 3 molesNO: 2 molesH₂O: 4 molesThe molar mass of the compounds is:
Cu: 63.54 g/moleHNO₃: 63 g/moleCu(NO₃)₂: 187.54 g/moleNO: 30 g/moleH₂O: 18 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Cu: 3 moles ×63.54 g/mole= 190.62 gramsHNO₃: 8 moles ×63 g/mole= 504 gramsCu(NO₃)₂: 3 moles ×187.54 g/mole= 562.62 gramsNO: 2 moles ×30 g/mole= 60 gramsH₂O: 4 moles ×18 g/mole= 72 gramsMass of water formedThe following rule of three can be applied: if by reaction stoichiometry 504 grams of HNO₃ form 4 moles of H₂O, 103.5 grams of HNO₃ form how many moles of H₂O?
moles of H₂O= (103.5 grams of HNO₃×4 moles of H₂O)÷504 grams of HNO₃
moles of H₂O= 0.82 moles
Finally, 0.82 moles of H₂O are made.
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Specify whether each of the items listed is hydrophilic or hydrophobic Triglycerides Carbohydrates Oil Cholesterol Glucose lons Polar compounds Water Lipids
Answers
Triglycerides, Oil, Cholesterol, and Lipids will come under hydrophobic. Carbohydrates, Glucose, Ions, Polar compounds, and water will come under hydrophilic.
Hydrophilic and hydrophobic are terms used to portray the interaction of molecules with water.
Hydrophilic molecules are those that are attracted to water and will generally dissolve in it. These molecules have polar nature, meaning they have a lopsided distribution of electrons, which permits them to frame hydrogen bonds with water molecules.
Hydrophobic molecules are those that repulse water and don't dissolve in it. These molecules have a nonpolar nature, meaning they have an even dispersion of electrons, which doesn't permit them to shape hydrogen bonds with water molecules.
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How many years are there in 1.10 s?
Express your answer using three significant figures.?
Answers
Answer:
Below
Explanation:
Number of seconds in one year
3600 s/hr * 24hr/day * 365.25 day/yr = 31 557 600 s/yr
1.10 s / 31 557 600 s/yr = 3.49 x 10^-8 yr
____has a mass number of_______, 25 protons, and 30 neutrons.
Answers
Answer: 1) Mn 2) 55
Explanation:
One of the great aspects of the periodic table is that the amount of protons corresponds to the element’s atomic number. That said, 25 protons = 25 atomic number = Manganese (or Mn).
As for mass number, just add the number of protons to neutrons. 25 + 30 = 55
identify the net ionic equation for the reaction that occurs when solutions of agno3 and nh4cl are mixed.
Answers
an proton in an electron rich environment will experience a (smaller/larger) blank1 - word answer please type your answer to submit magnetic field compared to the magnetic field applied to the sample by the instrument. this results in the chemical shift of the proton being shifted (upfield/downfield) blank2 - word answer compared a proton that experiences a magnetic field equal to the applied magnetic field.
Answers
A proton will encounter a reduced magnetic field in an environment where there are many electrons, which causes the proton's chemical shift to go downfield.
What causes a proton to move downward?
Electronegative substances that are also linked to carbon shift the resonance position of protons down field. By removing electron density from carbon and its directly bound protons, the electronegative element reduces the Be field's strength.
What causes proton peak downfield shifts?
The chemical shift shifts downfield (higher ppms) because the proton experiences a greater external magnetic field and hence requires a higher frequency to establish resonance.
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which statement(s) is/are true regarding chemical equilibria? select all that apply. g the rate constants for the forward and reverse reactions are equal when a chemical reaction is at equilibrium. the concentrations of reactants and products are constant at equilibrium.
Answers
Chemical reactions don't stop when they reach equilibrium.Both the forward and backwards reflexes often happen at the same rate.
What claims about chemical equilibrium are true?Authentic claims on chemical equilibrium:Reactant and product concentrations are both constant.Reactant and product concentrations are both constant.If there is no increase inside the concentration of the reactants or products, equilibrium has been reached.
Which of the following is accurate for every equilibrium system?The forward reaction rate is the same as the reverse reaction rate.Ah, so that's the claim.That's accurate.The forward and backward reactions happen at the same rate in an equilibrium, which is true.
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Identify which of these molecules has the highest boiling point and give the reasoning why in terms of intermolecular force. CHCl3, H2O, CO2
Answers
According to the forces of attraction, water has highest boiling point as it possesses hydrogen bonding.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which of the following is currently most often used to indicate the location of a signal on an IR spectrum? a. Vibration excitation (increase vibration) of the bonds. b. Rotational excitation (increase rotation) of the bonds c. Breaking of the bonds d. Electricfields appearing the molecule
Answers
The most popular technique for locating a signal on an IR (Infrared) spectrum is a. bond vibration excitation (increase in vibration). The basis for IR spectroscopy is light's interaction with molecules' vibrational modes.
Spectroscopy is the study of how electromagnetic radiation interacts with matter. It is a potent analytical method utilised in many disciplines, including physics, biology, and chemistry. In spectroscopy, a sample is subjected to electromagnetic radiation, and the interaction of the radiation with the sample that results is examined to learn more about the sample's structure, composition, and chemical and physical properties. There are various types of spectroscopy, such as IR (Infrared), UV-Vis (Ultraviolet-Visible), NMR (Nuclear Magnetic Resonance), and mass spectrometry. Each of these methods can be used for various studies and gathers data about the sample using various forms of electromagnetic radiation. To analyse the vibrational modes of bonds in a substance, IR spectroscopy, for instance, emits IR light.
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based on the given ir spectrum and mass spectrum of an unknown compound what is a possible structure for the unknown comound
Answers
Based on the given IR spectrum and mass spectrum of an unknown compound, the possible structure could be an organic compound with a molecular formula of C5H10.
This could be a straight-chain alkane with five carbon atoms and ten hydrogen atoms, such as pentane. The IR spectrum could show absorption bands corresponding to C-H and C-C stretching vibrations, and the mass spectrum could show a peak corresponding to the molecular ion at m/z 72.
This suggests that the compound is likely a straight-chain alkane, such as pentane. To confirm the structure, further analysis of the IR and mass spectra can be done to compare the values to those of known compounds.
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The apparatus shown below can be used to investigate the electrolysis of brine. What chemical
present in the sodium chloride solution provides the hydrogen that's collecting at the cathode?
Answers
The chemical present in the sodium chloride solution provides the hydrogen that's collecting at the cathode is water.
What is cathode ?In a polarized electrical device, the cathode is the metallic electrode through which current flows. An anode, on the other hand, is the electrode in a polarized electrical device through which current flows in from an external circuit.
NaCl is the formula for sodium chloride. So, The hydrogen had to be derived from the water in which the NaCl was dissolved. H2O is the formula for water.
Thus, The chemical present in the sodium chloride solution provides the hydrogen that's collecting at the cathode is water.
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Question number 4 and 5
Answers
Based on the given data:
the experimental percentage water in the hydrate is 22.0%the percentage error is 38.3%What is the percentage water in the hydrate?Mass of the hydrated salt = mass of evaporating dish + sample before heating - mass of evaporating dish
Mass of hydrated salt = 22.611 - 20.316
Mass of hydrated salt = 2.295 g
Mass of anhydrous salt = mass of evaporating dish + sample before heating - mass of evaporating dish + sample after 3rd heating
Mass of anhydrous salt = 22.611 - 22.106
Mass of anhydrous salt = 0.505 g
Experimental percentage water in the hydrate = 0.505/2.295 * 100%
Experimental percentage water in the hydrate = 22.0%
Percentage error = |True value - calculated value| / True value * 100%
Percentage error = |35.67 - 22.00|/35.67 * 100%
Percentage error = 38.3%
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identify the best conditions for reaction b. cat. h , naoch3 , dmso cat. h , naoch3 , ch3oh naoch3 , dmso ch3oh , heat naoch3 , ch3oh
Answers
Explanation:
The best conditions for reaction b are naoch3, ch3oh, and heat.
Developers are writing code and merging it into shared repositories several times a day, where it is tested automatically. Which of the following concepts does this BEST represent?
Functional testing
Storge procedures
Elasticity
Continuous integration
Answers
Hence option Continuous integration is correct choice.
This BEST represents the concept of Continuous Integration (CI).
A Dev Ops software development method called continuous integration (CI) enables developers to integrate code changes into a single repository for automated builds and tests. The build and unit test phases of the software release process are referred to as continuous integration. Every revision that is committed starts a build and test cycle. Code updates are automatically created, tested, and readied for deployment to production via continuous delivery.
What steps are taken in a continuous code cycle?
Continuous integration, continuous delivery, continuous deployment, and continuous testing are all components of ongoing development. The technique of continually adding new code commits to your source code is known as continuous integration.
Which four stages comprise the programming cycle?
Cycle of Program Development (PDLC) a procedure that contains five stages for developing a programme. analysis, design, development, testing, implementation, and maintenance of application software.
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f dry solute is heated, which of the following can occur? group of answer choices it will turn into an oil it will expand it may become damaged it will evaporate
Answers
Higher temperatures result in an increase in kinetic energy, which allows the solvent molecules to more efficiently damage the intermolecularly attracted solute molecules.
Solubility of the solute in the solution is increased by heating saturated solution. Because the particles gain kinetic energy as the temperature rises, they move faster, increasing the likelihood of collisions and diffusion. By giving energy to break bonds in the material, more heat is added, which speeds up the dissolving reaction. This is the most typical instance in which a rise in temperature results in a rise in the solubility of solids.
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ensuring that salespeople know the ethical and legal framework for their markets, including cultural and global market variations, is a salesforce response to which of the following issues?
Answers
A salesforce solution to accountability concerns is to ensure that salespeople are aware of the ethical and regulatory framework for their markets, including cultural and worldwide market variances.
Which of the following communication tactics does not entail face-to-face interaction between sales managers and salespeople?Sales managers have the right to discipline salesmen. As a result, they are often able to sway salespeople without resorting to coercion, threats, or promises.
Which of the following responsibilities for sales managers is the most crucial?One of a sales manager's most crucial responsibilities is inspiring the team. He needs to organise his team so that they work together as a single unit to achieve a common goal. He is responsible for making sure the team members get along well and don't fight.
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given 8.22 grams of CH4, how many grams of H2O are required?Please look at screenshot.
Answers
According to the stoichiometry of the given balanced chemical equation, 18.02 g of water are required for 1 mole of methane and 2 moles of water.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given chemical equation 1 mole of methane gives 2 moles of water, that is, 16 g methane gives 36 g water, thus, 8.22 g will give 8.22×36/16= 18.02 g of water are required.
Thus, 18.02 g of water are required for 1 mole of methane and 2 moles of water.
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in which of the following situations is angular momentum approximately conserved in a system? (hint: recall what conditions are necessary for translational momentum to be conserved.)
Answers
According to the law of conservation of angular momentum, when no net torque is applied to a system, which in this case refers to the rotating object or objects, angular momentum is conserved.
What is angular momentum?The rotational equivalent of linear momentum in physics is called angular momentum, also known as moment of momentum or rotational momentum.
It is a conserved quantity, meaning that the total angular momentum of a closed system stays constant, making it a significant physical quantity. Both the direction and the amplitude of angular momentum are conserved. The functional characteristics of bicycles and motorbikes, frisbees, rifled bullets, and gyroscopes are due to the conservation of angular momentum.
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if the initial pressure is 0.20 atm and the dinoitrogen pentaoxide decomposes completely. what is the final pressure?
Answers
The final pressure would depend on the number of moles of nitrogen dioxide and the volume of the container it is in, as well as any other gases that may be present. The final pressure nitrogen dioxide is 20 atm.
About Nitrogen DioxideNitrogen dioxide is a chemical compound with the formula NO₂. One of several nitrogen oxides, NO₂ is used as a synthetic material for the manufacture of nitric acid, which produces millions of tonnes annually. Nitrogen dioxide (NO 2 ) is a major contributor to smog formation and a precursor to many harmful secondary pollutants, including ozone and particulate matter. It is highly reactive with other chemicals and is a strong oxidizing agent. Nitrogen dioxide is a dark red-orange gas.
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2.5 pts on a piece of paper, write balanced molecular, total ionic, and net ionic equations for the reaction between aqueous solutions of sodium hydroxide and nitric acid. select the number that corresponds to the sum of the coefficient for the net ionic equation.
Answers
A chemical equation is said to be balanced when the total charge and the number of atoms for each component of the reaction are the same for both the reactants and the products.
Balanced molecular equation:
NaOH(aq) + HNO3(aq) -> NaNO3(aq) + H2O(l)
Total ionic equation:
Na+(aq) + OH-(aq) + H+(aq) + NO3-(aq) -> Na+(aq) + NO3-(aq) + H2O(l)
Net ionic equation:
OH-(aq) + H+(aq) -> H2O(l)
The sum of the coefficients for the net ionic equation is 3.
Lye and caustic soda are other names for sodium hydroxide, an inorganic substance having the formula NaOH. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).
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Compound A has the molecular formula C14H25Br and was obtained by the reaction of sodium acetylide with 1,12-dibromododecane. On treatment of compound A with sodium amide, compound B (C14H24) was obtained. Ozonolysis of compound B gave the diacid HO2C(CH2)12CO2H. Catalytic hydrogenation of compound B over Lindlar palladium gave compound C (C14H26), and hydrogenation over platinum gave compound D (C14H28). Further, C yielded O=CH(CH2)12CH=O on ozonolysis. Assign structures to compounds A through D so as to be consistent with the observed transformations.
Answers
The structures of the compounnds A and D are shown in the image attached.
What is ozonolysis?
Ozonolysis is a chemical reaction in which ozone (O3) is used to cleave carbon-carbon double bonds in organic compounds. The reaction typically results in the formation of carbonyl compounds (such as aldehydes or ketones) and the cleavage of the original molecule into two smaller fragments.
Ozonolysis is often used in organic synthesis as a tool for the functional group analysis of complex molecules. The reaction mechanism involves the attack of ozone on the double bond, followed by the formation of a highly reactive intermediate, which undergoes further reactions to produce the final products.
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How many F atoms are in 5.54 g of F2?
Answers
1.6×10²³ atoms of F are there in 5.54 g of F[tex]_2[/tex]. It is also the smallest piece of substance with chemical element-like characteristics.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The remainder is made up of a cloud of electrons with negative charges around a positive-charged nucleus made up of protons and neutrons.
moles of F[tex]_2[/tex]=5.54 / 37.9=0.14
number of atoms of F[tex]_2[/tex] = 0.14×6.022×10²³=8.4×10²²atoms
number of atoms of F=2×8.4×10²²atoms=1.6×10²³ atoms
Therefore, 1.6×10²³ atoms of F are there in 5.54 g of F[tex]_2[/tex].
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