In this assignment you will be asked to classify aqueous solutions of salts as to whether they are acidic, basic, or neutral. This is most easily done by first identifying how both the cation and anion affect the pH of the solution and then by combining the effects. After predicting the acid-base properties of these salts, you will then test your predictions in the laboratory. 1. State whether 0. 1 M solutions of each of the following salts are acidic, basic, or neutral. Explain your reasoning for each by writing ionic equations to describe the behavior of each salt in water: NACN, KNO3, NH4CI, NaHCO3, and Na3PO4,

NaCN: __________________

KNO3: _______________

NH4CI: ______________

NaHCO3: ______________

Na3PO4: ______________

Answer:

so the mass of sulphur dioxide = 0.208334 × 22.4 L = 4.6666816 L = 4666.6816 ml Therefore the volume of sulphur dioxide is 4666.6816 ml .

Explanation:

A horizontal line on a position-time graph indicates that the object is not moving; its position is not changing.

A position-time graph is a type of graph used to show the change in the position of an object over time. It is typically a line graph with the x-axis representing time and the y-axis representing position.

The slope of the line corresponds to the speed of the object, while the area under the line represents the total distance traveled by the object.

Furthermore, the velocity of an object is represented by the slope of a location graph. Hence, the slope's value at a given instant corresponds to the object's velocity at that precise moment.

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0.0279 mole of the excess reactant is left over if 1.98 mole of chlorine react with 1.98 moles of nitrogen.

The mole is defined as the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12. It is expressed as "mol". It contains 6.022 X1023 entities like particles, atoms, ions, molecules, etc. of the given substance. It measures the number of atoms, ions, or molecules. It is a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. It explains the number of atoms or other particles in a mole is the same for all substances.

If 1. 98 mole of chlorine reacts with 1. 98 moles of nitrogen. then, the we can calculate the amount of reactant left over with the help of the concept for mole.

Moles = 1.98 / 70.9

          = 0.0279

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The correct question is,

3Cl2 + 2N2 → 2N2Cl3

Molar masses:

chlorine gas = 70. 9 g/mole

nitrogen gas = 28. 02 g/mole

dinitrogen trichloride = 134. 27 g/mole

1. 98 mole of chlorine reacts with 1. 98 moles of nitrogen. How many moles of the excess reactant is left over?

The steps in scientific learning are observations, hypotheses, predictions, testing, analysis, and conclusion.

The steps of scientific learning are as follows:

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The Cationic molecular ions are more abundant than Anionic molecular ions because capacity of cationic to stabilise unpaired electrons make synthesis of cationic molecular ions less energetically demanding.

The capacity of cationic molecular ions to stabilise unpaired electrons makes the synthesis of cationic molecular ions less energetically demanding. The most advantageous reason for the abundance of cationic molecular ions is that the cosmic ray has so much energy that it is largely unaffected by the comparatively little energy necessary to ionise molecules. There is ample of radiation from a broadband source like the Sun to drive the molecules to high energy states from which they can be triggered and spontaneously emit. As a result, cationic molecular ions outnumber anionic ones.

Because of the low temperature and density of interstellar space, the most prevalent cationic molecular ion is H3+. Because its two electrons are sole valence electrons in the system, this H3+ is also thought to be a major source of cationic molecular ions.

Another reason for their prevalence is their capacity to stabilise unpaired electrons, which makes the production of cationic molecule ions less energetically demanding.

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The percent composition by mass of sodium chloride and potassium chloride in the mixture is 90.4% sodium chloride and 9.6% potassium chloride.

The percent composition by mass of sodium chloride and potassium chloride in the mixture can be calculated using the following equation:

%Mass Sodium Chloride = (Mass of Sodium Chloride / (Mass of Sodium Chloride + Mass of Potassium Chloride)) x 100

%Mass Potassium Chloride = (Mass of Potassium Chloride / (Mass of Sodium Chloride + Mass of Potassium Chloride)) x 100

Mass of Sodium Chloride = (32.8mL)(0.384M)(58.44g/mol) / 1000mL = 0.73 g

Mass of Potassium Chloride = 0.807 g - 0.73 g = 0.077 g

%Mass Sodium Chloride = (0.73 g / (0.73 g + 0.077 g)) x 100 = 90.4%

%Mass Potassium Chloride = (0.077 g / (0.73 g + 0.077 g)) x 100 = 9.6%
Therefore, the percent composition by mass of sodium chloride and potassium chloride in the mixture is 90.4% sodium chloride and 9.6% potassium chloride.

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1.3 Liters of a 0. 352M solution of CaSO4 would contain 62. 1g CaSO₄. So, option C is correct answer.

The solution has a concentration of 0.35M, it means that there ar 0.35M moles of CaSO₄ are there is the solution.

So, we can write is as,

Concentration = Moles/volume in Liters, this can be written as,

Concentration = Mass/Molar mass/volume in Liters

The molar mass of CaSO₄ is given to be 135.14 g/mol and the given mass of the compound is 62.1 grams. Now, putting all values,

0.35 = 62.1/(135.14V)

Volume = 1.35 Liters.

So, the volume of the solution required is found to be 1.35L hence option C is correct.

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A portion of the supernatant liquid was filtered and analysed after the precipitate settled. the ksp is 5.0 ×

[tex] {10}^{ - 4} [/tex]

The balanced chemical equation for the dissolution of AB2 in water is:

AB2 (s) ⇌ A2+ (aq) + 2B- (aq)

The solubility product expression for AB2 is:

Ksp = [A2+][B-]

[A2+] = 0.100 M × 0.5000 L / (0.5000 L + 0.5000 L) = 0.0500 M

[B-] = 0.205 M × 0.5000 L / (0.5000 L + 0.5000 L) = 0.1025 M

[A2+]_ppt = [A2+]_initial - [A2+]_filtered

[A2+]_ppt = 0.0500 M - 2.3 × 10M

[A2+]_ppt = 0.0500 M

[B-]_ppt = 2 × [A2+]_ppt

[B-]_ppt = 2 × 0.0500 M

[B-]_ppt = 0.100 M

Now, we can use these values to calculate the Ksp:

Ksp = [A2+][B-]^2

Ksp = (0.0500 M)(0.100 M)

Ksp = 5.0 ×

[tex] {10}^{ - 4} [/tex]

Therefore, the Ksp of AB2 is 5.0 ×

[tex] {10}^{ - 4} [/tex]

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TRNA binds to mRNA codon 5'-AUG-3' through complementary base pairing, carrying methionine.

Transfer RNA, also known by the acronym tRNA and formerly known as soluble RNA (sRNA), is an adaptor molecule made of RNA that, in eukaryotes, usually has a length of 76 to 90 nucleotides[2]. It acts as the physical connection between the mRNA and the amino acid sequence of proteins. tRNAs from bacteria usually have shorter genomes (mean = 77.6 bp) than those from archaea and eukaryotes (mean = 83.1 bp and 84.7 bp, respectively).

The mature tRNA exhibits the reverse trend, with eukaryotes having the smallest mature tRNAs (median = 74.5 nt), while tRNAs from bacteria are typically longer (median = 77.6 nt) than tRNAs from archaea (median = 76.8 nt).

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Considering the ideal gas law, if you have 0.857 moles of gas with a volume of 1.97 L at a pressure of 0.942 atm, the temperature is 26.407 K.

Ideal gas refers to a hypothetical gas composed of molecules that do not attract or repel each other and are approximated by point particles that themselves have no volume.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T), related by the ideal gas law. This law is an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar gas constant:

P×V = n×R×T

In this case, you know:

Replacing in the ideal gas law:

0.942 atm× 1.97 L = 0.857 moles× 0.082 (atmL)÷(molK)× T

Solving:

(0.942 atm× 1.97 L)÷ (0.857 moles× 0.082 (atmL)÷(molK))= T

26.407 K= T

Finally, the temperature is 26.407 K.

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The chemical formula is C₂₀H₂₄N₂.

To determine the empirical formula, we first need to calculate the number of moles of each element in the given compounds:

moles of carbon: 1.321 g CO₂ x (1 mol CO2/44.01 g CO₂) x (1 mol C/1 mol CO₂) = 0.030 mol C

moes of hydrogen: 0.325 g H₂O x (1 mol H₂O/18.015 g H₂O) x (2 mol H/1 mol H₂O) = 0.036 mol H

moles of nitrogen: 0.0421 g N x (1 mol N/14.01 g N) = 0.003 mol N

Next, we can calculate the mole ratio of each element by dividing the number of moles of each element by the smallest number of moles:

C: 0.030 mol C / 0.003 mol N = 10

H: 0.036 mol H / 0.003 mol N = 12

N: 0.003 mol N / 0.003 mol N = 1

Therefore, the empirical formula is C₁₀H₁₂N.

To find the molecular formula, we need to know the molar mass of the compound. We can calculate the molar mass of the empirical formula C₁₀H₁₂N as:

molar mass = (10 x 12.01 g/mol) + (12 x 1.01 g/mol) + (1 x 14.01 g/mol) = 162.22 g/mol

We can then calculate the molecular formula by dividing the molar mass of the compound by the molar mass of the empirical formula:

molecular formula = molar mass of compound / molar mass of empirical formula

= (324 g/mol) / (162.22 g/mol) = 1.998

Since the molecular formula should be a whole number, we can round it to the nearest whole number to get 2.

Therefore, the molecular formula is C20H24N2.

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The mass of copper produced is  0.635 g from the question that has been asked here.

Stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction. It involves the use of balanced chemical equations to determine the ratios of reactants and products in a reaction.

We can see that the reaction equation is;

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

Number of moles of Zn = 1.2g/65 g/mol

= 0.018 moles

Number of moles CuSO4 = 50/1000 * 0.2

= 0.01 moles

Then;

Since the reaction is 1:1

0.01 moles of CuSO4 will produce

0.01 mol * 63.5 g.mol

= 0.635 g

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Answer:

One mole of calcium carbonate reacts with 2 moles of HCl forms one mole of calcium chloride, water and carbon dioxide each. The theoretical yield of calcium chloride from 16.5 g of calcium carbonate is 18.3 g

Explanation:

CaCl 2(aq)→Ca 2+(aq)+2Cl −(aq) is a dissοciatiοn equatiοn fοr hοw calcium chlοride dissοciates in water.

A chemical reactiοn is the transfοrmatiοn οf οne οr mοre chemicals, knοwn as reactants, intο οne οr mοre new cοmpοunds, knοwn as prοducts. The change in cοncentratiοn οf any οf the reactants οr prοducts per unit οf time can be used tο determine the rate οr speed οf a reactiοn. It is determined by the equatiοn rate=time + cοncentratiοn.

When dissοlved in water, the lattice οf an iοnic crystal disintegrates. When an iοnic sοlid substance dissοlves, dissοciatiοn—the separatiοn οf iοns—οccurs. Iοnic substances that are placed in water will break apart intο a pοsitive iοn and a negative iοn, a prοcess knοwn as electrοlytic dissοciatiοn οr iοnic dissοciatiοn. Iοnizatiοn is a term used tο describe this kind οf dissοciatiοn respοnse. Iοnizatiοn is the name οf the reactiοn, while electrοlytic sοlutiοns are the results.

Therefοre,

CaCl 2(aq)→Ca 2+(aq)+2Cl −(aq) is a dissοciatiοn equatiοn fοr hοw calcium chlοride dissοciates in water.

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Particle splitting can occur through various mechanisms, such as nuclear fission, radioactive decay, and particle collisions.

Nuclear fission involves the splitting of an atomic nucleus into two or more smaller nuclei, releasing a significant amount of energy in the process. Radioactive decay is the natural process by which unstable atomic nuclei emit particles or radiation to become more stable. Particle collisions can also lead to the splitting of particles, as high-energy particles can break apart atomic nuclei or other particles.

These smaller particles may be subatomic particles such as protons, neutrons, and electrons, or even smaller particles like quarks and leptons.

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Answer:

309.1 mL

What is molarity?

The most common way to express solution concentration is molarity (M), which is defined as the amount of solute in moles divided by the volume of solution in litres: M = moles of solute/litres of solution.

To calculate volume required for the solution, we first must find number of moles (n) required. To do this, we can divide mass in grams, by molar mass. Molar mass can be found on a standard IUPAC Periodic Table (International Union of Pure and Applied Science).

n[(NH₄)₂SO₄] = m/MM = 449.4/[(14.01+1.008×4)×2+32.07+16.00×4]

= 3.4006 mol

Now we have moles of solute, as well as molarity, (from the question - 11M) Thus, we can calculate litres of solution.

Volume = moles ÷ molarity = 3.4006 / 11 = 0.309 L = 309.1 mL

the concentration of ClCH2CH2Cl in the vessel 5.80 seconds later would be 1.49 M.

The second-order rate law for the given reaction is:

rate = k[ClCH2CH2Cl]

where k is the rate constant.

We can use the integrated rate law for a second-order reaction to solve for the concentration of ClCH2CH2Cl at a later time:

1/[ClCH2CH2Cl]t = 1/[ClCH2CH2Cl]0 + kt

where [ClCH2CH2Cl]t is the concentration of ClCH2CH2Cl at time t, [ClCH2CH2Cl]0 is the initial concentration, and k is the rate constant.

Plugging in the values given in the problem, we get:

1/[ClCH2CH2Cl]t = 1/1.22 + (0.743 M-1 s-1)(5.80 s)

1/[ClCH2CH2Cl]t = 0.8205

[ClCH2CH2Cl]t = 1.220 M / 0.8205

[ClCH2CH2Cl]t = 1.487 M

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Answer:

Igneous and metamorphic rocks are two of the three major types of rocks found on Earth, with the third being sedimentary rocks. Igneous rocks are formed from the solidification of molten magma or lava, while metamorphic rocks are formed from the transformation of existing rocks due to high temperature and pressure.

The formation of igneous rocks begins when magma or lava cools and solidifies. Magma is molten rock that is located beneath the Earth's surface, while lava is magma that has erupted onto the surface. When magma or lava cools and solidifies, it forms igneous rocks. There are two types of igneous rocks: intrusive and extrusive. Intrusive igneous rocks form when magma cools and solidifies slowly beneath the Earth's surface, while extrusive igneous rocks form when lava cools and solidifies quickly on the Earth's surface. Examples of igneous rocks include granite, basalt, and pumice.

In contrast, the formation of metamorphic rocks occurs when existing rocks are transformed due to high temperature and pressure. Metamorphism can occur when rocks are buried deep within the Earth's crust, or when they are subjected to high pressure and temperature due to tectonic activity. The transformation of existing rocks can result in the formation of new minerals, textures, and structures within the rocks. Examples of metamorphic rocks include marble, slate, and gneiss.

In conclusion, the formation of igneous and metamorphic rocks differ in terms of their origin and formation process. Igneous rocks are formed from the solidification of molten magma or lava, while metamorphic rocks are formed from the transformation of existing rocks due to high temperature and pressure. While both types of rocks can be found in various locations around the world, they differ in their properties, appearance, and composition.

Explanation:

Every substance has some physical properties and chemical properties. The new substance is solid and the new substance forms into thin flat sheets can be considered as the inference based on the observations.

A physical property is defined as an any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe the changes between momentary states of the substance. These properties are  referred to as observables. Physical properties are not modal properties.

A chemical property is defined as any of a material's properties that becomes evident during or after a chemical reaction that is, any quality that can be established only by changing a substance's chemical identity.

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As a result, when the gas is cooled to a temperature below 45 °C, it will condense into a liquid condition. The pressure affects the precise temperature at which the gas will condense.

The slope of the solid-liquid equilibrium line for carbon dioxide is positive; when pressure is increased, the melting point rises.

Three triple points exist (a). (b) In an atmosphere, monoclinic is more stable than rhombic. (c) Sulfur changes state from liquid to vapour and back to liquid when heated from 80°C to 200°PC.

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A closed network of blood vessels, comprising arteries, veins, and capillaries, transports blood throughout the body.

These are some examples of the route blood takes:

The largest artery in the body, the aorta, is used to push blood out of the heart.

The aorta divides into smaller arteries that supply blood to the body's many organs and tissues.

The arteries gradually shrink to the size of arterioles, which are tiny channels that can assist control blood pressure and flow.

The tiniest blood veins in the body, known as capillaries, are then reached via arterioles. The blood and cells of the organism exchange nutrients and gases through capillaries.

Then, blood exits the capillaries and enters the tiny veins called venules.

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Answer: 18.5%

Explanation:

A. Thiele modulus for the three pellets is 1.78, 2.74, and 6.04 for conversion 3. 4 mm 36.9, 5.1 mm 31.7, and 9.5 mm 25.6 respectively

B. The yield of butadiene using catalyst particles with a diameter of 1. 0 and 7. 0 mm in a reactor of the same length is 0.118 and 0.073 respectively.

C. The Thiele modulus (φ) will rise for all the pellets if both rate constants are increased by a factor of 4, as the reactions speed up.

a) To calculate the Thiele modulus (φ) for each pellet, we can use the following equation:

φ² / (6 x Th) = -(1/2)ln(1-X)

where,

φ is the particle diameter

Th is the Thiele modulus

X is the conversion.

The conversion for the first pellet, which has a 3.4 mm diameter, is 36.9%. Thus,

Th = φ² / [tex](6\times(-1/2)ln(1-X))[/tex]

Th = [tex]3.4^2 / (6\times(-1/2)ln(1-0.369))[/tex]

Th = 1.78

The conversion for the first pellet, which has a 5.1 mm diameter, is 31.7%. Thus,

Th = φ² / [tex](6\times(-1/2)ln(1-X))[/tex]

Th = [tex]5.1^2 / (6\times(-1/2)ln(1-0.317))[/tex]

Th = 2.74

The conversion for the first pellet, which has a 9.5 mm diameter, is 25.6%. Thus,

Th =φ²/ [tex](6\times(-1/2)ln(1-X))[/tex]

Th = [tex]9.5^2 / (6\times(-1/2)ln(1-0.256))[/tex]

Th = 6.04

B) In order to compute the butadiene yield utilizing catalyst particles with diameters of 1.0 and 7.0 mm, we must first know the conversion at the reactor's end.

We may infer from the information provided that the conversion is a diminishing function of pellet size.

Hence, we may interpolate the conversion values for the two particle sizes:

Conversion at 1.0 mm

= 36.9 x (1 - ((1.0 - 3.4) / (9.5 - 3.4))

= 26.6%

Conversion at 7.0 mm

= 25.6 x (1 - ((7.0 - 3.4) / (9.5 - 3.4))

= 16.5%

Thus, we must account for both the conversion and the selectivity when calculating the butadiene yield.

The second reaction's selectivity ([tex]S_2[/tex]) may be represented as

[tex]k_2 / (k_1 + k_2)[/tex] = 0.8 / 1.8

= 0.444 since the reactions occur one after the other.

For the 1.0 mm particle, the yield of butadiene can be calculated as:

Yield

= Conversion x Selectivity

= 0.266 x 0.444

≈ 0.118

For the 7.0 mm particle, the yield of butadiene can be calculated as:

Yield

= Conversion x Selectivity

= 0.165 x 0.444

≈ 0.073

c) The Thiele modulus (φ) will rise for all the pellets if both rate constants are increased by a factor of 4, as the reactions speed up. For the same reactor duration and circumstances, this will lead to a drop in conversion and yield.

Using the Thiele modulus equation from section (a), we can recalculate the conversion and yield using the new rate constants to determine the magnitude of this effect.

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The rate of reaction, time taken to displace all of the water in a measuring cylinder will be greater for lumps of calcium carbonate or powder so that Carbon dioxide can escape.

Gases that do not dissolve in water can be trapped in water using a technique known as displacement of water.

This method necessitates the use of a delivery tube, a measurement cylinder, and a water basin.

We begin by filling a measuring cylinder with water and inverting it in a water basin. The gas is then bubbled into the inverted measurement cylinder through a delivery line. The water level falls as gas bubbles up and fills the inverted measuring cylinder.

The faster the response, the higher the quantity of mass lost. The quantity of mass loss, as demonstrated by the issue, is decreasing over time. It may be deduced from this that the pace at which the product particles are created is slowing and finally stopping.

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The amount of solid barium sulfate formed is 1.42g and 7.02 moles of sodium chloride are formed.

When 38.0 mL of 0.160 M barium chloride reacts with 54.0 mL of 0.065 M sodium sulfate, aqueous sodium chloride, and solid barium sulfate form. To determine the number of grams of solid barium sulfate formed, we must first calculate the amount of barium chloride and sodium sulfate used.

The amount of barium chloride used is equal to the product of the molarity and the volume, or 38.0 mL x 0.160 M = 6.08 mmol.

Similarly, the amount of sodium sulfate used is 54.0 mL x 0.065 M = 3.51 mmol.

The reaction between barium chloride and sodium sulfate is an exchange reaction:

BaCl₂(aq) + Na₂SO₄(aq) -> 2NaCl(aq) + BaSO₄(s)

We know that for every mole of barium chloride that is used, one mole of barium sulfate is formed, and for every mole of sodium sulfate used, two moles of sodium chloride are formed.

Therefore, 6.08 mmol of barium sulfate is formed and 7.02 mmol of sodium chloride is formed.

The number of grams of solid barium sulfate formed is equal to the product of the molar mass of barium sulfate and the number of moles of barium sulfate formed.

233.43 g/mol x 6.08 mmol = 1419.25 mg = 1.42g

In conclusion, when 38.0 mL of 0.160 M barium chloride reacts with 54.0 mL of 0.065 M sodium sulfate, 1.42g of solid barium sulfate, and 7.02 mmol of aqueous sodium chloride form.

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To solve this issue, we must use stoichiometry to calculate the relationship between the production of CO2 and the amount of C3H8.

Using its molar mass, we must first determine the moles of C3H8: C3H8 has a molar mass of 44.11 g/mol, which is calculated by multiplying 3 (12.01 g/mol) by 8 (1.01 g/mol). C3H8 moles are equal to 11.89 g / 44.11 g/mol, or 0.27 mol. Next, we apply the balanced chemical equation's C3H8 to CO2 mole ratio: Three molecules of CO2 are produced from one mol of C3H8. the following will be the moles of CO2 produced: The formula for moles of CO2 is: 0.27 mol C3H8 x (3 mol CO2/1 mol C3H8) = 0.81 mol CO2. Finally, we use its molar mass to translate the moles of CO2 into grammes: Molar mass of CO2 equals 12.01 g/mol plus 2 (16.00 g/mol), or 44.01 g/mol. mass of CO2 = 44.01 g/mol x 0.81 mol CO2 to get 35.64 g CO2. As a result, 11.89 g of C3H8 will result in 35.64 g of CO2.

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The motion of the red ball over the same time period | 20 | 100 | Red ball continues to travel 25 meters in 5 seconds.

Period, also known as the menstrual cycle, is the regular natural change that occurs in the reproductive system of women. It is a cycle of physical changes that happens to a female's body each month, usually lasting about 28 days. During this time, the uterus sheds its lining and a woman may experience bleeding from her. The period usually starts at puberty and ends when a woman reaches menopause.

| Time (s) | Position (m) | Explanation |

| - | - | - |

| 0 | 0 | Red ball starts at position 0 |

| 5 | 25 | Red ball travels 25 meters in 5 seconds |

| 10 | 50 | Red ball continues to travel 25 meters in 5 seconds |

| 15 | 75 | Red ball continues to travel 25 meters in 5 seconds |

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Answer:

we need 1.605 grams of AgNO3 to prepare 237.3 mL of 0.0312 M solution.

Explanation:

First, let's write down the formula for calculating the mass of a solute:

mass = molarity x volume x molar mass

We are given the volume and molarity of the solution, so we just need to find the molar mass of AgNO3.

AgNO3 has a molar mass of 169.87 g/mol.

Now we can substitute into the formula:

mass = 0.0312 mol/L x 0.2373 L x 169.87 g/mol

mass = 1.605 g

Therefore, we need 1.605 grams of AgNO3 to prepare 237.3 mL of 0.0312 M solution.

Answer:

0.965 grams.

Explanation:

To calculate the mass of Na₂SO4, we can use the formula:

mass = moles x molar mass

First, let's calculate the number of moles of Na₂SO4 in 435.2 mL of 0.0156 M solution:

moles = volume (in L) x molarity

moles = 0.4352 L x 0.0156 mol/L

moles = 0.0067872 mol

The molar mass of Na₂SO4 is 142.04 g/mol, so we can calculate the mass of Na₂SO4 as:

mass = moles x molar mass

mass = 0.0067872 mol x 142.04 g/mol

mass = 0.965 g

Therefore, the mass of Na₂SO4 used to prepare 435.2 mL of 0.0156 M Na₂SO4 solution is 0.965 grams.