Solid calcium carbide, cac2, reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, c2h2
CaC2(s)+2H2O(l)→Ca(OH)2(aq)+C2H2(g)
A solution is a homogeneous mixture of two or more components with particle sizes less than 1 nm. Common examples of solutions are the sugar in water and salt in water, soda water, etc. All components appear as one phase in the solution.
Examples of solutions include salt water, rubbing alcohol, and sugar dissolved in water. If you mix salt and water and look closely, you will not see any salt particles and you will have a homogeneous mixture.
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Write a balanced chemical equation for the reaction that occurs when dimethylether, ch3och3(g), is combusted in air.
The balanced chemical equation for the reaction occurs when dimethyl ether, ch3och3(g), is combusted in air.
CH3OCH3(g) + 3O2(g) ----> 2CO2(g) + 3H2O(l)
A chemical is a substance with a defined composition. That is, chemicals are always made up of the same "things". Some chemicals are found in nature, such as water. Other chemicals are also manufactured, such as chlorine (used in bleaching fabrics and in swimming pools).
There are four main types of compounds, distinguished by how the atoms are bonded together. Molecular compounds are bound by covalent bonds. Ionic compounds are held together by ionic bonds. Intermetallic compounds are held together by metallic bonds. Coordination complexes are held together by coordinate covalent bonds. Non-stoichiometric compounds form a controversial edge case.
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What multiplicities are observed for the signals in the off-resonance decoupled 13c nmr spectrum of (2e)-3-chloro acrylaldehyde?
The multiplicities that are observed for the signals in the off-resonance decoupled 13c nmr spectrum of (2e)-3-chloro acrylaldehyde is a singlet, a triplet, and a quartet. The correct option is E.
What is off-resonance decoupling?Off-resonance decoupling is a process of removing all hydrogen and carbon coupling from a signal except for the place which is near the nucleus or joined with the nucleus.
In NMR also, the coupling of hydrogen and carbon is removed except for the place near the nucleus.
Thus, the correct option is E) a singlet, a triplet, and a quartet.
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The question is incomplete. Your most probably complete question is given below:
A) 2 singlets and a doublet
B) a singlet and 2 doublets
C) 3 singlets
D) a singlet, a doublet, and a triplet
E) a singlet, a triplet, and a quartet
42.0 ml of 0.130 m naoh and 37.6 ml of 0.360 m naoh. assume that the volumes are additive.
Mixed molarity is 0.254 M
The volumes are additive is 1.22 M
Part A
mixed molarity = (M1 V1 + M2V2 )/ V1+V2
= (0.150 x 42 + 0.370 x 37.6 ) / (42+37.6)
= 0.254 M
NaOH = 0.254M
[Na+ ]= 0.254M
[OH-]= 0.254M
Part B
[Na+] = 2 x 44 x 0.1 / 44 + 25
= 0.1275 M
{SO4-2] = 44 x 0.1 / 44 + 25 = 0.063 M
[K+] =25 x 0.17 / 44 + 25 = 0.062 M
[Cl-] = 25 x 0.17 / 44 + 25 = 0.062 M
Part C
KCl moles = 3.70 / 74.55 = 0.0493
KCl molarity = 0.0493 / 0.075 = 0.66M
[K+] = 0.66 M
[Ca+2] = 0.280 M
[Cl-] = 0.66 + 2 x 0.280 = 1.22 M
Volume is a measurement of three-dimensional space that is occupied. Numerous imperial units or SI-derived units, such as the cubic meter and liter, are frequently used to quantify it numerically (such as the gallon, quart, and cubic inch). Volume and length (cubed) have a symbiotic relationship. The volume of a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the amount of fluid (liquid or gas) that the container may hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardized containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes.
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Molecules with only single bonds do not generally exhibit liquid-crystalline properties because?
Because they lack the stiffness required for alignment, molecules with only single bonds do not generally display liquid-crystalline characteristics. One or more atoms make up a molecule. The biological substances, such as proteins and DNA, can be composed of thousands of the atoms.
A molecule is composed of atoms that have been joined together. So, whereas an atom is a separate thing, a molecule is generated when those atoms come together. These elements are may be the same, such as the two oxygen atoms bonded together (O2), or they may be different atoms linked together, such as the water (H2O).
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What metal wil not react with hydrochloride acid? Please help
How many moles of oxygen are consumed in the complete combustion of 1.60 moles of benzene, c6h6?
In the complete combustion of 1.60 moles of benzene, C6H6, 12 moles of oxygen, O2, is consumed.
Combustion is defined as the process of burning something. In chemistry, combustion refers to the chemical process between a fuel and an oxidant, usually oxygen to produce heat and light in the form of flame.
In a complete combustion, oxygen is sufficient to react with any hydrocarbons to produce carbon dioxide and water.
Balancing the combustion reaction of benzene, we have:
2C6H6 + 15 O2 = 12CO2 + 6H2O
Based on the balanced combustion reaction above, 2 moles of benzene requires 15 moles of oxygen to have a complete combustion.
If we have 1.60 moles C6H6,
moles O2 = mole ratio x mole of benzene
moles O2 = (15 moles O2/2 moles C6H6) x 1.60 moles C6H6
moles O2 = 12
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When combing your dry hair with a hard rubber comb, you rub electrons from your hair onto the comb. (a) is your hair then positively- or negatively-charged?
When combing your dry hair with a tough rubber comb, you rub electrons from your hair onto the comb then our hair is charged because On rubbing the comb with dry hair, the electrons from the hair are transferred to the comb due to Static energy.Hence comb becomes charged .
What is Static energy?
Static electricity is an imbalance of electric charges within or on the surface of a material or between materials.
Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build abreast of the surface of an object until they find a way to be released or discharged.
What is static energy used for?
Static electricity has several uses, also called applications, within the real world. One main use is in printers and photocopiers where static electric charges attract the ink, or toner, to the paper. Other uses include paint sprayers, air filters, and mud removal. electricity can also cause damage.
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How many kilograms are there in 50.0 lbs? (2.2 lbs = 1kg)
**Answer with 2 decimal places and no unit
Answer:
22.68
Explanation:
Since about 2.2 lbs = 1kg, 50 pounds is about 22.68.
What dipeptides would be formed by heating a mixture of valine and n -protected leucine?
Valine-valine and valine-leucine would be formed by heating a mixture of valine and N-protected leucine.
Amino acid leucine is protected at the N-terminal end, so it is not available to form a polypeptide at that end.
Peptide bond is a covalent chemical bond linking two consecutive alpha-amino acids from C1 (carbon number one) of one alpha-amino acid and N2 (nitrogen number two) of another along a peptide or protein chain.
Valine and leucine can react and form dipeptide valylleucine (valine-leucine), see picture below.
When two valine amino acids react, dipeptide valylvaline (valine-valine) is formed.
Polypeptide is a long and unbranched peptide chain with more than ten amino acids.
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Identify the homogeneous mixture among the following:
fog
air
milk and cereal mixture
ice cubes in soda
Analyze the diagram showing the changing states of matter. Drag the item from the item bank to its corresponding match.
The correct matches for changes of state are:
1 or 3 : Arrow that shows particles getting closer togethergas: State of matter that would fill any containerliquid: State of matter with definite volume but NOT shape2 or 4: Arrow that shows particles gaining energysolid: State of matter with definite shapeWhat is change of state?Change of state is the process whereby matter in one physical state is converted to matter in another state by the addition or removal of heat.
The process of change of state are:
Melting: solid to liquid due to addition of heatVaporization: liquid to gas due to addition of heatSublimation: solid to gas due to addition of heatFreezing: liquid to solid due to removal of heatCondensation: gas to liquid due to removal of heatDeposition: gas to solid due to removal of heatConsidering the given diagram, the correct matches are:
1 or 3 : Arrow that shows particles getting closer togethergas: State of matter that would fill any containerliquid: State of matter with definite volume but NOT shape2 or 4: Arrow that shows particles gaining energysolid: State of matter with definite shapeIn conclusion, change of state of matter occurs due to heat changes.
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When a sugar crystal is placed in water, every time a sucrose molecule dissociates from the crystal, water molecules surround it in a cloud forming a(n):______.
A sugar crystal is placed in water, every time a sucrose molecule dissociates from the crystal, water molecules surround it in a cloud forming a hydration shell.
What is a hydration shell?
The term "hydration shell" refers to a more or less continuous cluster of water molecules that surround and are somewhat linked to another substance that the water molecules are drawn to because it is hydrophilic, or water loving.
Since there is space between matter particles and sugar crystals, the level of water does not significantly rise when sugar crystals dissolve in it, keeping the water level constant.
Thus, every time a sucrose molecule separates from a sugar crystal in water, a cloud of water molecules forms around the crystal, creating a hydration shell.
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According to the bohr model, what is the energy change in joules that occurs when an electron falls from the n = 4 to the n = 2 energy level in a hydrogen atom?
According to the bohr model, the energy change in joules that occurs E=−1.36×10∧−19J, when an electron falls from the n = 4 to the n = 2 energy level in a hydrogen atom.
What is bohr model ?The Bohr model, also known as the Rutherford-Bohr model, was first proposed by Niels Bohr and Ernest Rutherford in 1913 and describes an atomic system with an orbiting system of electrons and a small, dense nucleus that is similar to the Solar System in structure but is attracted by electrostatic forces rather than gravity.
1) The orbits of the electrons surrounding the nucleus are circular and have a constant energy.
2) The electron only rotates in orbits with angular momentum greater than or equal to nhi/2π³.
Only when an electron transitions from one orbit to another can energy become realised or absorbed in the form of a photon.
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Calculate the molarity of a 853.5 mg sample of KIO3 is dissolved in enough water to make 250.0 ml of solution.
The molarity of a solution of KIO3 is dissolved in enough water to make 250.0 ml of solution is 0.1595.
What is molarity?Molarity is the measure of the concentration of any solute per unit volume of the solution.
M = {n}{V}
The molar mass of KIO3 is 214.001
Given the mass is 853.5 mg
First, we calculate the number of moles
moles = mass / molar mass
853.5 / 214.001 = 3.988
Now, molarity can be calculated
The number of moles is 3.988
The volume is 250.0 ml
Putting the values in the formula
M = 3.988 / 250.0 = 0.1595
Thus, the molarity is 0.1595.
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Consider the following: you mix 7.60 ml of ( = 1.492 g/ml) and 6.50 ml of ( = 2.890 g/ml), giving 14.1 ml of solution. what is the density of this mixture?
The 14.1 ml solution has a density of 2.1365 g/ml.
Density is defined as the ratio between the mass of a substance and the volume it occupies. Denoted by ρ, density is mass per unit volume and the formula is given below:
ρ = mass / volume
To solve for the density of a mixture or solution of two substances with different densities, the mass and volume of each substance must be known, as:
ρ mix = (M1 + M2) / (V1 + V2)
The volume and densities of the two given substances are known and can be used to solve for the unknown mass of each substance.
M1 = ρ x V1
M1 = 1.492 g/ml x 7.60 ml
M1 = 11.3392 g
M2 = ρ x V2
M2 = 2.890 g/ml x 6.50 ml
M1 = 18.785 g
Solving for the density of the mixture,
ρ mix = (M1 + M2) / (V1 + V2)
ρ mix = (11.3392 g + 18.785 g) / (7.60 ml + 6.50 ml)
ρ mix = 30.1242 g / 14.1 ml
ρ mix = 2.1365 g/ml
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F an object weighs 38.325 lbs, what would be the mass in grams? (2.20 lbs = 1 kg)
If an object weighs 38.325 lbs = 17,400 g would be mass in grams
Define massIn physics, mass is a numerical representation of inertia, which is a basic characteristic of all matter. The resistance a body of matter offers to a change in its speed or location as a result of the application of a force is what it is in essence. The change a force applies produces a change that is smaller the more mass a body has.
The kilogram, which is defined in terms of Planck's constant as equal to 6.62607015 × 10^ -34 joule second, is the unit of mass in the International System of Units (SI). One kilogram times one square meter per second squared is equivalent to one joule.
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A given short peptide, sgyal contains _________ peptide bonds. any given short peptides/protein contain at least _____ amino group(s) (nh3 ) and ______ carboxyl group(s) (-coo- ).
A given short peptide, SGYAL contains four peptide bonds. Any given short peptides/protein contain at least one amino group(s) (nh3 ) and one carboxyl group(s) (-coo- ).
SGYAL stands for secretaria general y asuntos legales. Sgyal is also written as Ser-Gly-Tyr-Ala-Leu . The structure of SGYAL is shown in the image attached. SGYAL contains four peptide bonds as highlighted by yellow color in the structure of SGYAL.
Peptide bond is formed by the condensation of carboxylic group of one molecule and amino group of other molecule. Any given short peptides/protein contain at least one amino group(s) ([tex]NH_{3}[/tex]) and one carboxyl group(s) ( -COO-).
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Does average mass depend on the number of particles in the sample? What are the advantages and disadvantages of using the “average-of-averages” mass to calculate the expected mass of 100 particles?
(A lab on small scale matter and mole)
As long as the sample has the same number of atoms for both elements, the mass ratio is independent of the sample size.
The arithmetic mean is calculated by adding a set of numbers, dividing by their count, and then taking the result. The molecular masses of different substances vary. Therefore, variable numbers of atoms, molecules, or moles exist in masses of equal mass. On the other hand, equal quantities of moles of different substances have different masses. The result will be disproportionately impacted by the one data point if you attempt to calculate an "average of averages". In essence, the value of the average of 10,000 data points is the same as that of the average of a single data point.
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several emergent properties of water contribute to the suitability of the environment for life. how does the ability of water to function as a versatile solvent arise from the structure of water molecules?
The ability of water to function as a versatile solvent arise from the structure of water molecules are because:
Water molecules form hydrogen bonds with atoms that are part of polar covalent bonds other molecules
Water's versatility as solvent arises from the polar covalent bonds of water molecules.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
In water, atoms of hydrogen (H) and oxygen (O) are connected by polar covalent bonds.
Covalent bond is bond between nonmetals. Hydrogen and oxygen are nonmetals.
Solvation is the interaction of solvent (water) with molecules or ions (for example K⁺ and I⁻) in a solute.
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In a photochemical process a hydroen atom absorbs a 410 nm photon and shortly thereafter it emits a 2628 nm photon. what is the change in energy for the combination of these processes?
0.389×10^−19J is the change in energy for the combination of these processes.
λ1=410nm=410×10^−9m
λ2=2628nm=2628×10^−9m
E1−E2 = Energy absorbed by the atom in the process =hc[1/λ1−1/λ2]
=6.63×3[1/410−1/2628]×10^−9 = 0.389×10^−19J
We get, 0.389×10^−19J.
Energy is the quantitative property that is transferred to a body or to a bodily system, recognizable in the performance of work and in the structure of warmth and light. Energy is a conserved quantity—the regulation of conservation of energy states that strength can be transformed in form, however not created or destroyed. The unit of size for energy in the International System of Units (SI) is the joule (J).
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When using a water-cooled condenser, the water should_____the condenser. to make this happen, the water should flow in at the____and should flow out at the_____.
A water-cooled condenser must have the water flowing over it continuously to function. The water must enter through the bottom port and exit through the top port for this to occur.
What is condenser?
A device or component used to condense vapor into liquid is a condenser (heat transfer). HVAC air coils are an example of specific sorts. Condenser (laboratory), a group of glassware used in laboratories to cool fluids.
The condenser's job is to take the high-pressure gas coming from the compressor and turn it into a liquid. By using the idea that heat will always travel from a warmer to a cooler substance, it accomplishes this.
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Which observation most likely indicates that only a chemical change has taken place?(1 point)
The change cannot be reversed.
The shape changes
States of matter changes.
A reaction occurs.
The observation most likely indicates that only a chemical change has taken place the change cannot be reversed.
What is a Chemical change?
A chemical change is a change of one substance into another, the formation of new compounds with different properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or decomposition to form more substances).Burning, rusting, rotting, and frying are a few instances of chemical change. Boiling, melting, freezing, and shredding are a few examples of physical changes.When bonds between molecules or atoms are formed, disrupted, or both, chemical changes result. This implies that material is changed from one with a certain set of attributes (such as melting point, color, flavor, etc.) into another with a different set of properties.Hence, The observation indicates chemical change is the change that cannot be reversed.
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the rate constant for this first‑order reaction is 0.930 s−10.930 s−1 at 400 ∘c.400 ∘c. a⟶products a⟶products how long, in seconds, would it take for the concentration of aa to decrease from 0.810 m0.810 m to 0.260 m?0.260 m? ????
It would take 1.23 seconds for the concentration of A to decrease from 0.810M to 0.260 M.
Balanced chemical equation: A → product
c₀(A) = 0.810 M; initial concentration of reactant A
c(A) = 0.260 M; concentration of reactant A after time t
k = 0.930 s⁻¹; the rate constant for this first‑order reaction
ln c(A) = ln c₀(A) - k·t; a first-order is proportional to the concentration of the reactant.
t = (ln c₀(A) - ln c(N₂O₅)) ÷ k.
t = (-0.21 + 1.35) ÷ 0.930 s⁻¹.
t = 1.14 ÷ 0.930 s⁻¹
t = 1.23 s; duration of this chemical reaction
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how is an atom formed?
Answer: See below.
Explanation: An atom is made up of protons, neutrons and electrons.
Contrast mass, volume, and density.
Plss need help asap
The density is the ratio of the mass to the volume.
What is density?The term density refers to the ratio of mass to the volume of a substance. Given that mass is the quantity of matter in a body, we could use it to obtain the density of the body.
We know that solids have a definite volume, liquids have a definite volume but a gas does not have a definite volume. The volume of a gas is the same as the volume of the container where it is kept. This is why gases could be compressed but a solid and a liquid can not be compressed likewise.
The volume tells us how much space that an object expects to occupy. We have to combine the mass and the volume to get the density of an object. As such, we can see that the density is the ratio of the mass to the volume.
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If the dissolution of borax in water is spontaneous, is the change in enthalpy positive or negative - or are both signs possible? choose... why do you predict this? choose... choose... .
If the dissolution of borax in water is spontaneous, the change in enthalpy will be both positive and negative. It can be predicted by the sign of the enthalpy change depending on the temperature.
What is borax?Borax is a hydrated borate of sodium. It is a salt. When borax is mixed in water, it is converted into boric acid and the pH will be 9.13.
Enthalpy is a total heat energy present in a closed system, also called a thermodynamic system.
Thus, the change in enthalpy will be of both signs. Predicted by the sign of the change in temperature.
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Which reactions are oxidation-reduction reactions? check all that apply. fes(s) 2hcl(aq) → h2s(g) fecl2(g) agno3(aq) nacl(aq) → agcl(s) nano3 2c3h6(g) 9o2(g) → 6co2(g) 6h2o(g) fe2o3(s) 3co(g) → 2fe(l) 3co2(g)
oxidation-reduction reactions are -
2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g)Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)For reaction,
2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(g)On reactant side:
Oxidation state of Carbon = +2
Oxidation state of Oxygen = 0
On product side:
Oxidation state of Carbon = +4
Oxidation state of Oxygen = -2
Here, carbon's oxidation state is rising from +2 to +4. As a result, it is oxidizing and the oxygen's oxidation state is decreasing from 0 to -2. As a result, it is decreasing.
For reaction,
Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
When reacting:
Iron's oxidation state is +3.
Carbon's oxidation state is +2.
On product side:
Iron's oxidation state is zero.
Carbon's oxidation state is +4.
Here, carbon's oxidation state is rising from +2 to +4. As a result, it is being oxidized and the iron's oxidation state is changing from +3 to 0. As a result, it is decreasing.
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Chloroplasts are oval disks containing green chlorophyll in plant cells. Animal cells lack chloroplasts because they - OPTIONS do not perform photosynthesis. have cilia for movement. use mitochondria for photosynthesis. do not have cell walls.
According to the research, the correct option is do not perform photosynthesis. Animal cells lack chloroplasts because they do not perform photosynthesis.
What are Animal cells?It is a eukaryotic type cell belonging to the Animalia kingdom and can reproduce independently and depending on the tissue to which they belong, they fulfill specific functions that define their morphology, their function and their needs.
In this sense, plants carry out photosynthesis since their cells have chloroplasts, which house chlorophyll, essential for obtaining energy from sunlight, on the other hand, animal cells lack these organelles and instead have what is necessary for oxidation glucose (respiration).
Therefore, we can conclude that according to the research, the correct option is do not perform photosynthesis. Animal cells lack chloroplasts because they do not perform photosynthesis.
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A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it?
A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it Equatorial.
An atom is a single neutral particle. A molecule is a neutral particle with two or more atoms bonded together. Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. The bond is a polar covalent bond (polar bond) due to the high electronegativity of the oxygen atom.
About 99% of the body consists of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. Something like table salt (NaCl) is a compound because it is made up of multiple elements (sodium and chlorine), but it is not a molecule because the bonds that hold NaCl together are ionic bonds.
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1. How much NaCl can you get from 20g of NaOH?
NaOH + HCl →→ NaCl + H₂O
Answer:
29.25g
Explanation:
Number of moles = Mass / Molar mass
Number of moles of NaOH = 20g/(23 + 16 + 1)
= 0.5mol
1 mol of NaOH = 1 mol of NaCl
Therefore, 0.5mol of NaOH = 0.5mol of NaCl
0.5mol = Mass of NaCl / (23 + 35.5)
Mass = 0.5 × 58.5
= 29.25g
I hope this helps! ^^