Question 1

What is the molarity of a solution prepared by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500.0 mL of solution?

Accepted Answer

$$0.171\ \mathrm{M}$$

Question 2

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{AgCl}$$

Question 3

Which of the following is a nonelectrolyte?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} ($$glucose)

Question 4

What is the net ionic equation for the reaction between aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 5

Which of the following best describes the complete ionic equation for the reaction of $$\mathrm{HCl}$$ with $$\mathrm{NaOH}$$?

Accepted Answer

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

Question 6

A 25.0 mL sample of $$0.200\ \mathrm{M}$$ $$\mathrm{H_2SO_4} is $$titrated with $$0.100\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$100.0\ \mathrm{mL}$$

Question 7

Which of the following is a gas-evolution reaction?

Accepted Answer

$$\mathrm{Na_2CO_3 (aq) + 2HCl (aq) \rightarrow 2NaCl (aq) + H_2O (l) + CO_2$ (g)}$$

Question 8

What is the oxidation state of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 9

Which species is the oxidizing agent in the reaction $$\mathrm{Zn (s) + Cu$$^{2+}$$ (aq) \rightarrow Zn$$^{2+}$$ (aq) + Cu (s)}$$?

Accepted Answer

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

Question 10

Which of the following reactions is spontaneous under standard conditions?

Accepted Answer

$$\mathrm{2Al (s) + 3Cu$$^{2+}$$ (aq) \rightarrow 2Al$$^{3+}$$ (aq) + 3Cu (s)}$$

Question 11

Convert a pressure of $$745\ \mathrm{mmHg} to $$atmospheres.

Accepted Answer

$$0.980\ \mathrm{atm}$$

Question 12

A sample of gas occupies $$2.50\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$25^\circ\mathrm{C}. $$What volume will it occupy at $$2.00\ \mathrm{atm}$$ and $$25^\circ\mathrm{C}$$?

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 13

Calculate the number of moles of $$\mathrm{O_2$}$$ gas in a $$10.0\ \mathrm{L}$$ container at $$300\ \mathrm{K}$$ and $$2.00\ \mathrm{atm}$$ using the ideal gas law.

Accepted Answer

$$0.815\ \mathrm{mol}$$

Question 14

A mixture of $$\mathrm{N_2$}$$, $$\mathrm{O_2$}$$, and $$\mathrm{CO_2$}$$ has partial pressures of $$0.50\ \mathrm{atm}$$, $$0.30\ \mathrm{atm}$$, and $$0.20\ \mathrm{atm}$$, respectively. What is the total pressure?

Accepted Answer

$$1.00\ \mathrm{atm}$$

Question 15

How many grams of $$\mathrm{CO_2$}$$ are produced from the complete combustion of $$5.00\ \mathrm{g} of$$ $$\mathrm{C_2H_6}$$? ($$\mathrm{C_2H_6 + 3.5O_2 \rightarrow 2CO_2 + 3H_2O}$$, molar mass $$\mathrm{C_2H_6} = 30.07\ \mathrm{g/mol}$$, $$\mathrm{CO_2$} = 44.01\ \mathrm{g/mol})$$

Accepted Answer

$$14.6\ \mathrm{g}$$

Question 16

According to the kinetic molecular theory, which of the following statements is true?

Accepted Answer

Gas particles move in straight lines until they collide with something.

Question 17

Calculate the root mean square velocity ($$u_{rms}) of$$ $$\mathrm{N_2$}$$ molecules at $$300\ \mathrm{K}$$. ($$M = 28.0\ \mathrm{g/mol}$$, $$R = 8.314\ \mathrm{J/(mol\cdot K)})$$

Accepted Answer

$$517\ \mathrm{m/s}$$

Question 18

If a sample of $$\mathrm{H_2$}$$ gas effuses four times faster than a sample of another gas, what is the molar mass of the unknown gas?

Accepted Answer

$$64.0\ \mathrm{g/mol}$$

Question 19

Which of the following statements about real gases is correct?

Accepted Answer

Real gases deviate from ideal behavior at high pressures and low temperatures.

Question 20

Which of the following is an example of potential energy?

Accepted Answer

A compressed spring

Exam 3 Study Guide: Solutions, Gases, and Thermochemistry

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