Question 1

Which law is illustrated by the balanced chemical equation $$\mathrm{CH_4$(g) + 2\ O_2$(g) \rightarrow CO_2$(g) + 2\ H_2O(g)}$$?

Accepted Answer

Law of Conservation of Mass

Question 2

Given the reaction $$2\ \mathrm{C_4H_{10}(g) + 13\ O_2$(g) \rightarrow 8\ CO_2$(g) + 10\ H_2O(g)}$$, how many moles of $$\mathrm{CO_2$}$$ are produced from 1 mole of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

4

Question 3

Which of the following is the correct net ionic equation for the reaction between aqueous lead(II) nitrate and potassium iodide?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2\ I^-(aq) \rightarrow $$PbI_2$$(s)}$$

Question 4

A solution contains 5.25 g of oxalic acid ($$\mathrm{C_2O_4H_2}) $$dissolved in 155 mL of water (density = $$1.00\ \mathrm{g/mL}). $$What is the percent by mass of oxalic acid in the solution?

Accepted Answer

3.28%

Question 5

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

Silver chloride ($$\mathrm{AgCl})$$

Question 6

What is the empirical formula of a compound that contains 61.31% C, 5.14% H, 10.21% N, and 23.33% O by mass?

Accepted Answer

$$\mathrm{C_7H_7NO_2}$$

Question 7

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{Zn(s) + 2\ H^+(aq) \rightarrow Zn$$^{2+}$$(aq) + H_2$(g)}$$

Question 8

What is the oxidation number of oxygen in $$\mathrm{H_2O_2}$$?

Accepted Answer

$$-1$$

Question 9

How many molecules are present in 0.032 g of water ($$\mathrm{H_2O}$$)? ($$\mathrm{M_{H_2O} = 18.02\ g/mol})$$

Accepted Answer

$$1.07 	imes 10$$^{21}$$

Question 10

A reaction has a theoretical yield of 52.9 kg of Ti, but only 42.8 kg is actually obtained. What is the percent yield?

Accepted Answer

80.9%

Question 11

Which of the following best describes a limiting reactant?

Accepted Answer

The reactant that is completely consumed first

Question 12

What is the molarity of a solution prepared by dissolving 10.0 g of NaCl ($$\mathrm{M_{NaCl} = 58.44\ g/mol}) in $$enough water to make 500 mL of solution?

Accepted Answer

0.342 M

Question 13

Which of the following is the correct balanced equation for the combustion of ethane ($$\mathrm{C_2H_6}$$)?

Accepted Answer

$$\mathrm{2\ C_2H_6 + 7\ O_2$ \rightarrow 4\ CO_2$ + 6\ H_2O}$$

Question 14

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 15

How many grams of $$\mathrm{CO_2$}$$ are produced from the combustion of $$3.5 	imes 10$$^{15}$$ g of octane ($$\mathrm{C_8H_{18}}$$)? ($$\mathrm{M_{C_8H_{18}} = 114.22\ g/mol}$$, $$\mathrm{M_{$$CO_2$$} = 44.01\ g/mol}$$, 2$$\ \mathrm{C_8H_{18} + 25\ $$O_2$$ ightarrow 16\ $$CO_2 + 18$$\ H_2O}$$)

Accepted Answer

$$2.16 	imes 10$$^{16}$$ g

Question 16

Which of the following is the correct net ionic equation for the neutralization of HCl with NaOH?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Stoichiometry and Chemical Reactions: Structured Study Notes

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