Question 1

Which set of coefficients balances the following reaction? 
$$\mathrm{H_3PO_4(aq) + NaOH(aq) \rightarrow Na_3PO_4(aq) + H_2O(l)}$$

Accepted Answer

1, 3, 1, 3

Question 2

Which of the following best describes the reaction: 
$$\mathrm{$$HClO_4$$(aq) + KOH(aq) \rightarrow $$KClO_4$$(aq) + H_2O(l)}$$?

Accepted Answer

Double-replacement

Question 3

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

$$\mathrm{NaCl}$$

Question 4

Which set of reactants will form a precipitate upon mixing?

Accepted Answer

$$\mathrm{$$BaCl_2$$(aq) + LiOH(aq)}$$

Question 5

Which compound contains chlorine with an oxidation state of $$-5$$?

Accepted Answer

$$\mathrm{$$ClO_4$$^-}$$

Question 6

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{2FeCl_3(aq) + 3H_2S(g) \rightarrow 2FeS(s) + S(s) + 6HCl(aq)}$$

Question 7

Which of the following metal ions is easiest to reduce (has the highest reduction potential)?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$}$$

Question 8

How many moles of $$\mathrm{CO_2$}$$ are formed by the reaction of $$0.153$$ mol $$\mathrm{C_6H_8}$$ with excess $$\mathrm{O_2$}$$? 
$$\mathrm{C_6H_8(l) + 5O_2(g) \rightarrow 3CO_2(g) + 4H_2O(g)}$$

Accepted Answer

0.459 mol $$\mathrm{CO_2$}$$

Question 9

Determine the mass of $$\mathrm{SO_2$}$$ formed when $$5.5 g$$ $$\mathrm{$$SOCl_2$$}$$ reacts with excess $$\mathrm{Li}$$: 
$$\mathrm{2Li + $$SOCl_2$$ \rightarrow 2LiCl + SO_2$} 
($$Molar mass $$\mathrm{$$SOCl_2$$} = 119.0 g/$$mol, $$\mathrm{SO_2$} = 64.1 g/$$mol)

Accepted Answer

2.96 g $$\mathrm{SO_2$}$$

Question 10

Calculate the number of moles of $$\mathrm{NH_3$(g)}$$ produced when $$0.150$$ mol $$\mathrm{N_2$} is $$allowed to react with $$0.430$$ mol $$\mathrm{H_2$}$$: 
$$\mathrm{N_2$(g) + 3H_2(g) \rightarrow 2NH_3(g)}$$

Accepted Answer

0.287 mol $$\mathrm{NH_3$}$$

Question 11

A reaction has a theoretical yield of $$3.40$$ mol and an actual yield of $$3.22$$ mol. What is the percent yield?

Accepted Answer

94.7\%

Question 12

A $$750 mL $$bottle of $$86-$$proof bourbon has a molarity of $$7.4 M $$ethanol ($$\mathrm{C_2H_5OH}). $$Determine the number of millimoles of ethanol in the bottle.

Accepted Answer

5.6 	imes $$10^3$ mmol

Question 13

Determine the mass of $$\mathrm{NaOH}$$ that is necessary to neutralize $$1.25 L of$$ $$0.255 M$$ $$\mathrm{H_3PO_4}$$: 
$$\mathrm{H_3PO_4(aq) + 3NaOH(aq) \rightarrow Na_3PO_4(aq) + 3H_2O(l)}$$

Accepted Answer

38.2 g $$\mathrm{NaOH}$$

Question 14

Combustion analysis of a $$10.00 g $$sample of an organic compound yields $$18.07 g$$ $$\mathrm{CO_2$}$$ and $$6.14 g$$ $$\mathrm{H_2O}. $$The molar mass of the compound is $$146 g/$$mol. What is the molecular formula of the compound?

Accepted Answer

$$\mathrm{C_8H_{10}O_2$}$$

Question 15

Which of the following best describes the class of reaction for: 
$$\mathrm{2Al(s) + Fe_2O_3(s) \rightarrow 2Fe(l) + Al_2O_3(s)}$$?

Accepted Answer

Single-replacement (redox)

Question 16

How many grams of iron metal are produced when $$25.00 g of $$aluminum reacts with $$40.00 g of $$iron(III) oxide according to: 
$$\mathrm{2Al(s) + Fe_2O_3(s) \rightarrow 2Fe(l) + Al_2O_3(s)} 
($$Molar masses: $$\mathrm{Al} = 26.98 g/$$mol, $$\mathrm{Fe_2O_3} = 159.7 g/$$mol, $$\mathrm{Fe} = 55.85 g/$$mol)

Accepted Answer

27.9 g

Question 17

You wish to make a fortified wine with an alcohol content of $$20.0\% by $$volume by combining a cheap red wine ($$12.0\% by $$volume) with vodka ($$45.0\% by $$volume). How many mL of each would you need to combine to make $$1.00 L of $$the fortified wine?

Accepted Answer

286 mL vodka, 714 mL wine

Question 18

Which of the following pairs of ions will form an insoluble compound in water?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$}$$ and $$\mathrm{SO_4$^{2-}}$$

Question 19

Which of the following best explains why $$\mathrm{NaCl} is a $$strong electrolyte?

Accepted Answer

It completely dissociates into ions in water.

General Chemistry Exam Study Guide: Chemical Reactions, Stoichiometry, and Solution Chemistry

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