The initial concentration of NaOH in the reaction mixture is 0.028 M, as this is the concentration of the solution that was added to the reaction mixture.
The addition of 6.8 mL of 0.028 M NaOH to 5.5 mL of 0.011 M crystal violet will result in a final volume of 12.3 mL and the concentration of NaOH will be diluted by the addition of the crystal violet solution. The final concentration of NaOH will depend on the reaction that occurs between the two solutions and may not be the same as the initial concentration of either of the solutions added. However, for the purpose of determining the initial concentration, it is considered to be 0.028 M.
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Rank the following ions in order of increasing basicity. be sure to answer all parts.
CH3CH2^- CH3NH^- CH3O^-
lowest basicity intermediate basicity highest basicity
The basicity of CH3CH2 is greatest, CH3NH is middle, and CH3O is lowest. Being basic is a characteristic of a base (not really an acid).
What base is this?A base is a chemical that reacts with hydrogen ions to neutralize the acid. The majority of foundations are mineral compounds that combine with acids to create water and salts. The oxides, hydroxides, and trace elements of metals are examples of bases. Alkaline solutions are the solubility bases. Alkalies include sodium hydroxide.
Which base has the most strength?Because it totally dissociates into salts and hydroxide ions, sodium chloride is the stronger base. Further away from the acid, such strong acids are bathed with hydrogen ions, totally ionizing the hydrogen ions.
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What is the driving force of currents in the oceans and atmosphere?
Answer:
wind
Explanation:
Winds drive currents that are at or near the ocean's surface. Near coastal areas winds tend to drive currents on a localized scale and can result in phenomena like coastal upwelling.
what would be the volume in ml of 5.003 g of water delivered by a 5 ml pipet? you observe the temperature and find the density to be 0.9963 g/ml
The volume of 5.097 g of water at 25 degrees Celsius is 5.121 mL.
The volume of 5.097 g of water can be determined by using its density, which at a temperature of 25 degrees Celsius is 0.9971 g/mL.
To find the volume,
divide the mass by the density:
5.097 g / 0.9971 g/mL = 5.121 mL
This means that 5.121 mL of water has a mass of 5.097 g. To deliver this amount of water with a 5 mL pipet, one would simply measure out 5.121 mL of water using the pipet. It's important to note that the density of water changes with temperature, so the volume of a given mass of water will also change with temperature.
Complete question is provided in the image below.
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lipid molecules (also known as fats and oils) are made of long chains of hydrogen and what other element? question 3 options: oxygen nitrogen sulfur carbon
Answer:carbon
Explanation:
How are proteins separated in 2D gel electrophoresis?
Proteins separated on 2-D gels by mass in the spatial level and by charge (isoelectric level, pI) in the first phase in 2-D gel electrophoresis.
What can we learn from electrophoresis?We can determine how many distinct Nucleic acids are contained in a sample and how big they are in relation to one another using electrophoresis. A standard "yardstick" comprised of Plasmid dna of known sizes may be used to assess the size of a dna fragment to estimate its absolute size.
What steps make up the electrophoresis process?The following list of fundamental processes for performing gel electrophoresis includes: Pouring the gel, getting ready your samples, loading the gel, running the gel (trying to expose it to an electric current), and running the gel
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you add 8.5 g of iron to 24.30 ml of water and observe that the volume of iron and water together is 25.38 ml . calculate the density of iron.
The density of iron is 7.8g/cm^3
The formula for density=Mass/Volume
Mass=8.5g
Volume=25.38-24.30=1.08ml
Since 1ml=1 cm^3
New Volume =1.08cm^3
Using density=Mass/Volume
=8.5/1.08=7.8g/cm^3
How is density determined?
The ratio of an object's mass to its volume is its density. Grams per cubic centimeter, or g/cm3, are frequently used to measure density. Keep in mind that a volume is measured in cubic centimeters, not grams (the same volume as 1 milliliter).
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how many moles of o2 would be required in a combustion reaction with c6h6 to produce 15000 j of work at 298k?
n = ΔH / (-R * T) = -15,000 J / (-8.31 J/mol*K * 298 K) = 0.102 moles. To find the amount of O₂ required in the reaction, the energy change (ΔH) for the reaction must be determined.
The reaction can be assumed to be exothermic because the products have a higher energy than the reactants.
ΔH = -15,000 J
Using the balanced equation for the reaction, the moles of C₆H₆ can be calculated using the given ΔH value:
ΔH = -n * R * T
Where n is the number of moles of O₂, R is the gas constant (8.31 J/mol*K), and T is the temperature in Kelvin (298 K).
Solving for n:
n = ΔH / (-R * T) = -15,000 J / (-8.31 J/mol*K * 298 K) = 0.102 moles.
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Complete question:
How many moles of O₂ would be required in a combustion reaction with C₆H₆ to produce +15000. J of work at 298 K?
C₆H₆(l) +15/2-02(g) → 6CO₂(g) + 3H₂O(l)
With your class, look up the element names for each symbol in the word “BOOK” and list the element names.
Answer
Explanation: The word BOOK; is made up of 4 letters and each actually represents the symbol of an element. An element ...
Explanation:
ion-selective electrodes, for ph determinations, are called selective rather than specific because they actually measure the:
Because they actually monitor one ion's activity significantly more than the activity of the other ions present, ion selective electrodes are dubbed selective rather than specific.
What is ion selective electrodes?
A specific ion electrode (SIE), also referred to as an ion-selective electrode (ISE), is a transducer that transforms the activity of a particular ion dissolved in a solution into an electrical potential. The Nernst equation states that the voltage is theoretically dependent on the logarithm of the ionic activity. Analytical chemistry and biochemical/biophysical research that calls for measurements of ionic concentration in an aqueous solution uses ion-selective electrodes. Ion-selective electrodes (ISEs) typically use one of four basic forms of ion-selective membrane: glass, solid state, liquid based, or compound electrode.
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cinnamaldehyde is less polar than limonene because it has more carbon atoms. (True or False)
False. The quantity of carbon atoms in a molecule does not largely control its polarity.
What are carbon atoms?The fundamental constituents of organic molecules, carbon atoms are also fundamental to the structure and characteristics of many chemical substances. The capacity of carbon atoms to establish potent covalent bonds with other carbon atoms as well as with other elements like hydrogen, oxygen, nitrogen, and sulphur makes them special.
Both limonene and cinnamonaldehyde are naturally occurring chemicals with unique molecular structures that affect their polarity. Limonene, a terpene with a nonpolar structure, is less polar than cinnamonaldehyde, which has a carbonyl functional group (C=O). Cinnamaldehyde may dissolve in polar solvents like water because of its polar nature, whereas limonene is more soluble in nonpolar solvents like oils. In many applications, a molecule's polarity is crucial because it influences the compound's solubility and stability.
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Ok so goodmorning, im submitting this nearpod today but i need help on this Mean Median Mode an range i got the answers to the others i need answer to the Mode it complicated because the number is showing twice for both of them these are the numbers!!
68,62,65,68,70,70,59
an 68 is showing 2 times and 70 is showing 2 times so now how do i know whats the mode if its showing twice??
a can contains 325 ml of soda. how much is left after 244 ml is removed? (express your answer to the correct number of significant figures and proper units.)
After 244 ml of soda is removed, there is 325 ml - 244 ml = 81 ml left in the can. This answer should be reported with the correct number of significant figures and proper units, which in this case would be 81 ml (3 significant figures).
When calculating the remaining amount of a substance after a portion has been removed, it is important to consider both the accuracy and units of the measurements involved. In this case, a can contains 325 ml of soda and 244 ml of soda has been removed. To find the remaining amount, we subtract the amount removed from the original amount: 325 ml - 244 ml = 81 ml. The answer should be reported with the correct number of significant figures, which reflects the level of accuracy of the measurements, and proper units, which in this case would be 81 ml (3 significant figures). It is important to use the correct number of significant figures and proper units when reporting the results of any calculation, as this helps to ensure the accuracy and consistency of the results, and makes it easier for others to understand and interpret the results.
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vanadium has atomic radius 134 pm and crystallizes with a body-centered cubic unit cell. calculate its density.
The density of vanadium having atomic radius 134 pm which crystallizes with a body-centered cubic unit cell is 6.10 g/cm^3.
The density of a material can be calculated using its atomic weight and crystal structure. For a body-centered cubic (BCC) crystal structure, the formula for density is given by:
=> Density = Atomic weight / (Atomic volume x N Avogadro)
Where the atomic volume is given by:
=> Atomic volume = (Atomic radius)^3 x (4/3) x π
And N Avogadro is Avogadro's number (6.022 x 10^23 atoms/mol).
For vanadium, with an atomic radius of 134 pm, the atomic volume can be calculated as follows:
=> Atomic volume
= (134 pm)^3 x (4/3) x π
= (0.134 nm)^3 x (4/3) x π
= 3.66 x 10^-23 m^3/atom
The atomic weight of vanadium is approximately 50.94 g/mol. Plugging in these values into the formula for density gives:
=> Density
= 50.94 g/mol / (3.66 x 10^-23 m^3/atom x 6.022 x 10^23 atoms/mol)
= 6.10 g/cm^3
So the density of vanadium is approximately 6.10 g/cm^3.
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Answer:
Explanation:
5.71
in addition to the (1) name of the chemical and (2) special warnings, what else must be on the label of all stock solutions you may prepare in the laboratory
3. The concentration of the solution, 4. The date of preparation and 5. The name of the person who prepared the solution. must be on the label of all stock solutions you may prepare in the laboratory.
All laboratory-prepared stock solutions must have the following information on their labels:
- The name of the solution
- The name of the solution
- An expiration date
- Any unique storage demands
- The proper hazard labels, such as "toxic," "corrosive," "flammable,"
concentration of the solution etc.
Solutions include: 1. Buffering techniques; Salt remedies; Sugar alternatives; Acid remedies; Basic answers; combinations of solvent ;Products with metal ions; Protein remedies;DNA remedies; enzymatic remedies
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consider a hypothetical reaction in which a and b are reactants and c and d are products. if 23 g of a completely reacts with 28 g of b to produce 18 g of c, how many grams of d will be produced?
Think about a fictitious process where the reactants are A and B and the products are C and D. The product D will be produced in an amount of 33 g.
23 grams in A.
28 grams in B.
18 grams of C.
D = x gms.
Let's make the following equation:
23 g 28 g 18 g x g?
A+ B= C+ D
2. The Law of Mass states that the total amount of reactants A and B reacted will equal the total amount of products C and D produced.
If x = (23+28) — 18 = 33 g, product D will be produced in an amount of 33 g.
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in a lewis structure that contains a polar covalent bond, how do you demonstrate which atom in a bond has the highest electronegativity?
In a Lewis structure that contains a polar covalent bond, the atom with the highest electronegativity will have the partial negative charge, indicated by a delta symbol (-).
Lewis structure, also called electron-dot structure, is a structural formula in which electrons are represented by dots; two dots between two atoms represent a covalent bond.
The polarity of the bond is determined by the difference in electronegativity between the two bonded atoms, with the more electronegative atom having a stronger affinity for electrons and taking on a partial negative charge.
For example, in a bond between chlorine (Cl) and hydrogen (H), nitrogen is more electronegative than hydrogen and will have a partial negative charge. This would be represented in the Lewis structure as Cl (-) - H (+).
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what is the mass percent of oxygen in propionic acid, c3h6o2?
Propionic acid has a mass percent of oxygen of approximately 53.18%.
The ratio of the mass of the solute contained in a solution to the mass of the solution as a whole is known as the mass percent.
Propionic acid has a molecular formula [tex]C_{3}H_{6}O_{2}[/tex]. To calculate the mass percent of oxygen in propionic acid, multiply the mass of oxygen in one mole of propionic acid by the total mass of one mole of propionic acid and multiply by 100.
Propionic acid weighs 60.1 g per mole. Propionic acid's oxygen atoms have a total mass of 2 x 16.0 g = 32.0 g.
As a result, the oxygen mass percent in propionic acid is:
[tex]\frac{32}{60.1}[/tex] × 100 = 53.18%
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A piece of uranium 238 weighs 1000kg. How much of this isotope will remain about 36 x 10^9 years
The mass of the isotope that would remain is 300 g.
What is the half life?
The half-life of a substance is the time it takes for half of the substance to decay or disappear. It is a fundamental concept in the field of radioactivity and is used to describe the rate at which radioactive isotopes decay.
We know that the half life of the uranium 238 is 4.5 * 10^6 years. Then we know that;
N/No = (1/2)^t/t1/2
N = amount at time t
No = amount initially present
t1/2 = half life
t = time taken
Thus we have;
N/1000 = (1/2)^36 x 10^9 / 4.5 * 10^6
N = [ (1/2)^3.6 x 10^9 / 4.5 * 10^6 ] * 1000
N = 300 g
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determine the molarity of a k2co3 aqueous solution that is 12.0% by mass given that its density is 1.108 g/cm3. provide your answer with 3 significant figures.
The molarity of the K2CO3 aqueous solution is 0.080 M. This value can be calculated using the formula:
Molarity = moles/volume
To determine the molarity of a K2CO3 aqueous solution, we'll need to calculate the number of moles of K2CO3 present in the solution, and then divide by the volume of the solution.
First, let's convert the concentration from percent by mass to grams:
12.0% by mass K2CO3 x (1 g / 100 g) = 0.12 g K2CO3
Next, we'll use the density of the solution to find its volume:
V = m / ρ = 0.12 g / (1.108 g/cm^3) = 0.108 cm^3
Next, we'll convert the volume to liters:
V = 0.108 cm^3 x (1 L / 1000 cm^3) = 0.000108 L
Now, we can calculate the number of moles of K2CO3 in the solution:
n = m / M = 0.12 g / (138.2 g/mol) = 0.000868 mol
Finally, we can calculate the molarity of the solution:
M = n / V = 0.000868 mol / 0.000108 L = 0.080 M (3 significant figures)
So the molarity of the K2CO3 aqueous solution is 0.080 M.
Molarity is an important concept in chemistry because it allows us to quantify the amount of a substance in a solution and to compare the concentration of different solutions. For example, molarity can be used to compare the concentration of different solutions of the same solute, to determine the amount of solute needed for a reaction, or to calculate the amount of solute that has been consumed or produced in a reaction.
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according to the experimental procedure, which method will be used to mix the analyte solution while titrating? select one: glass stirring rod magnetic stir bar thermometer gentle swirling
The method used to mix the analyte solution during the titration based on the experimental procedure is a glass stirring rod.
What is an analyte solution?Analyte or titrate is a solution whose concentration is unknown. Titrant is a standard solution whose concentration is known. Acid-base indicators are substances that change color as they approach the equivalence point.
This titration method has the goal of quantitatively determining a substance in solution with other substances/solutions whose concentration is known through reactions until it reaches the stoichiometric point gradually using a glass stir bar to mix with the analyte solution.
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would it be wrong to dissolve the original impure substance in a large excess of solvent? please explain your answer.
If you add a bunch of the solvent, the solution could not be concentrated enough to recrystallize.
In order to have a solution that is saturated, it is essential that you incorporate the smallest possible quantity of the boiling solvent. If you add an excessive amount of solvent to the mixture, the solution may become too watered down for crystals to form.
It is essential to get the flask down to room temperature before placing it in ice water to finish the cooling process. A hurried crystal formation will result in the crystal lattice becoming contaminated with contaminants. In addition to this, the crystals that form will be more diminutive.
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What makes organic compounds soluble in water?
Keep in mind that organic molecules that are water soluble must have functional groups that either contain oxygen or nitrogen. Methanol is the next organic solvent that is likewise quite polar.
Is organic really preferable?Food production without the use of chemical pesticides offers several advantages. In comparison to traditional agricultural practices, organic methods have been found to have 40% greater yields during dry spells, utilize 45% lower energy, and emit 40% less carbon.
Does clean imply organic?Anything with the USDA Certified Organic designation is obligated to be grown without synthetic additions like pesticide, synthetic fertilizers, and dyes, as well as without being processed with industrial solvents. It is essentially the cleanest food you can eat if you wish to consume just organic foods.
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a pressure gauge connected to a tank reads 50 psi at a location where barometric pressure is 29.1 hg. determine absolute pressure. phg
Absolute pressure when a pressure gauge reads 50 psi where barometric pressure is 29.1 in Hg is 130.67 in Hg or 64.18 psi
The absolute pressure in the tank can be determined by adding the gauge pressure (50 psi) to the barometric pressure ( athmospheric pressure ) (29.1 in Hg) converted to psi. To convert from in Hg to psi, we can use the conversion factor 1 psi = 2.036 in Hg.
So, the atmospheric pressure in psi is: 29.1 in Hg x (1 psi / 2.036 in Hg) = 14.18 psi
And the absolute pressure in the tank is: 50 psi + 14.18 psi = 64.18 psi
If we want to use unit of in Hg then 64.18 psi = 64.18 x 2.036 = 130.67 in Hg
Thus, the absolute pressure in the tank is 64.18 psi or 130.67 in Hg
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calculate the rf value for a spot in a tlc experiment if the solvent moved 14.9 cm and the spot moved 6.5 cm from the origin.
The Rf value for a spot in a TLC experiment if the solvent moved 14.9 cm and the spot moved 6.5 cm from the origin is 0.43.
What is solvent?
A solvent is a substance that can dissolve an insoluble solute and create a solution. Solvents are often liquids, although they can also be solids, gases, or supercritical fluids. The amount of solute that dissolves in a given volume of solvent changes depending on the temperature. Dry cleaning, paint thinners, nail polish removers, glue solvents, spot removers, detergents, and scents are a few applications for solvents. Polar molecules can float in water. The most used solvent is water because it can virtually completely dissolve all solutes.
[tex]Rf = \frac{Distance traveled by the compound}{Distance traveled by the solvent front}[/tex]
[tex]=\frac{6.5}{14.9} \\=0.43[/tex]
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it requires 33.7 ml of 0.345 m naoh to completely neutralize 25.0 ml of h2so4. what is the concentration of the h2so4?
The concentration of the H2S04 is 0.2325M
Volume of ,[tex]H2S04,V1=25.0mL[/tex]
The volume of NaOH, [tex]V2=33.7mL[/tex]
Molarity of NaOH, [tex]M2=0.345m[/tex]
To find: Molarity of [tex]H2SO4,(M1)[/tex]
Formula Used: [tex]n1V1M1=n2V2M2[/tex] where [tex]n1[/tex] and [tex]n2[/tex] are the number of proton/ hydroxides transferred during the reaction
Solution:
[tex]n1=2[/tex](since each molecule may release two protons)
[tex]n2=1[/tex] (since each NaOH molecule may produce one hydroxide ion)
By changing the variables in the formula, we arrive at
[tex]n1V1M1=n2V2M2\\2*25.0*M1=1*33.7*0.345\\\\M1=\frac{1*33.7*0.345}{2*25.0}\\\\M1=\frac{11.6265}{50}\\\\M1=0.23253M\\[/tex]
There fore,The concentration of the H2S04 is 0.2325M
Oil of vitriol, also known as sulfuric acid (American spelling, preferred IUPAC name), or sulphuric acid (Commonwealth spelling), is a mineral acid made up of the elements hydrogen, oxygen, and sulphur, and has the chemical formula H2SO4. It is a viscous liquid that is miscible with water. It has no colour or smell.
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calculate the entropy change for the vaporization of one mole of ammonia, nh3, at its normal boiling point of 240 k.
The entropy change for the vaporization of one mole of ammonia at 240 K is approximately 128 J/K.
The entropy change for a phase change can be calculated using the heat of vaporization (ΔH) and the normal boiling point (T) of the substance.
The entropy change (ΔS) is given by the equation:
ΔS = ΔH / T
For the vaporization of one mole of ammonia (NH3), the heat of vaporization (ΔH) can be obtained from tables of thermodynamic data.
The normal boiling point of ammonia is 240 K.
Plugging in these values, the entropy change for the vaporization of one mole of ammonia at 240 K can be calculated as:
ΔS = ΔH / T = 128 J/K
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what ion is described by 38 protons, 38 neutrons, 36 electrons? group of answer choices sr2 os2 ca2 kr2
The ion described by 38 protons, 38 neutrons, and 36 electrons is likely to be a calcium ion, Ca2+. Calcium has an atomic number of 20, meaning it has 20 protons, and therefore 20 electrons in a neutral atom.
If it has gained two electrons, it will have 22 electrons, and a charge of 2-, which matches the description of a Ca2+ ion.
Calcium is an important element in the human body and the environment. It is essential for strong bones and teeth, healthy blood clotting, and nerve function.
Calcium is also involved in many other biological processes, such as muscle contraction and the regulation of heart rate. In the environment, calcium is found in rocks, such as limestone and marble, and is an important component of soil.
Calcium compounds are used in a variety of industrial applications, such as the production of cement, glass, and paper.
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why is my car smoking under the hood but not overheating
A certain fluid has poured on the engine, causing the vehicle to smoke under the hood without overheating.
What do you understand by the term 'fluid' ?fluids are any liquids, gases, or basically any materials that, when under stress, exhibit a continual change in shape and are unable to withstand tangential or shearing forces at rest.
What exactly are fluid properties?Thermostat, density, and composition are a few of the most basic ideas in fluid characteristics. Extensive properties, or properties which are dependent on the quantity of material present, include mass and volume.Temperature, pressure, and density are some examples of intense properties.
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the liquid and ______ states are called the _______ states of matter because their particles are very close together
Because of molecules in both liquids and solids are already so near to one another, they are repeatedly alluded to as condensed phases.
Liquids are what?A liquid seems to be a nonlinear material fluid with a (almost) constant volume regardless of pressure that adapts to the structure of its container. Since it has a set dimension but no stationary phase ( a solid, it is among the four primary states of nature (some others being solidity, gas, as well as plasma).
Which seven liquids are there?Chardonnay (excluding balsamic vinegar), honey pollen, sunflower oil, cream (including whey), dew, human blood, and rain are the 7 liquids involved in this situation. Normally, blood is not something that is eaten, but in some cases, it has been used to treat illnesses.
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a homogeneous mixture was prepared by mixing 0.50 g a, 108.9 how many hours will it take to fill a cubic vat of 14.2 ft edge length with a liquid that has a density of 1.23 g/ml and is spilling at a rate of 2.69 kg/s?g b and 30.92 g c. the volume is found to be 77.5 cm3. what is the density of the mixture given to the correct number of significant digits?
A homogeneous mixture was prepared by mixing 0.50 g a, 108.9 how many hours will it take to fill a cubic vat of 14.2 ft edge length with a liquid that has a density of 1.23 g/ml and is spilling at a rate of 2.69 kg/s?g b and 30.92 g c. the volume is found to be 77.5 cm3. It will take approximately 16.5 hours to fill the cubic vat with the liquid.
The density of the mixture can be determined using the formula:
density = mass / volume
First, find the total mass of the mixture:
mass = 0.50 g + 108.9 g + 30.92 g = 140.32 g
Next, convert the volume from [tex]cm^{3}[/tex] to mL:
volume = 77.5 [tex]cm^{3}[/tex] x (1 mL/1 [tex]cm^{3}[/tex]) = 77.5 mL
Finally, calculate the density of the mixture:
density = mass / volume = 140.32 g / 77.5 mL = 1.81 g/mL
So, the density of the mixture is 1.81 g/mL.
As for the time it will take to fill the cubic vat, you can use the formula:
time = volume / (rate x conversion factor)
First, convert the volume of the vat to liters:
volume = 14.2 ft x 14.2 ft x 14.2 ft = 4355.57 [tex]ft^{3\\[/tex] = 123.3 [tex]m^{3}[/tex] = 123,300 L
Next, convert the rate from kg/s to L/s:
rate = 2.69 kg/s / (1.23 g/mL) = 2.18 L/s
Finally, calculate the time it will take to fill the vat:
time = volume / rate = 123,300 L / 2.18 L/s = 56,501.85 s = approximately 16.5 hours
So, it will take approximately 16.5 hours to fill the cubic vat with the liquid.
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