Question 1

A sample of gas occupies 8.0 L at 2.0 atm. If the pressure is decreased to 1.0 atm at constant temperature, what will be the new volume of the gas? (Use Boyle's Law)

Accepted Answer

$$16.0\ 	ext{L}$$

Question 2

A gas occupies 600 mL at $$30^\circ	ext{C}. $$What volume will it occupy at $$90^\circ	ext{C}$$, assuming constant pressure? (Use Charles's Law)

Accepted Answer

$$800\ 	ext{mL}$$

Question 3

If 2.0 mol of gas occupies 10 L, how many liters will 6.0 mol occupy at the same temperature and pressure? (Use Avogadro's Law)

Accepted Answer

$$30\ 	ext{L}$$

Question 4

A gas has a pressure of 1.2 atm at 300 K. What is the pressure at 450 K, assuming constant volume? (Use Gay-Lussac's Law)

Accepted Answer

$$1.8\ 	ext{atm}$$

Question 5

How many moles of gas are in a 5.00 L container at 2.50 atm and 310 K? (Use the ideal gas law: $$PV = nRT$$, with $$R = 0.0821\ 	ext{L}\cdot	ext{atm}/	ext{mol}\cdot	ext{K})$$

Accepted Answer

$$0.49\ 	ext{mol}$$

Question 6

What mass of $$	ext{O}_2$$ gas occupies 44.8 L at STP? (1 mol $$	ext{O}_2 = 32 g$$, 1 mol gas = 22.4 L at STP)

Accepted Answer

$$64\ 	ext{g}$$

Question 7

Convert 755 torr to atm. (1 atm = 760 torr)

Accepted Answer

$$0.993\ 	ext{atm}$$

Question 8

What is the density of $$	ext{CO}_2 ($$molar mass = 44 g/mol) at STP? (Use $$	ext{Density} = \frac{	ext{MM}}{22.4\ 	ext{L}})$$

Accepted Answer

$$1.96\ 	ext{g/L}$$

Question 9

What is the molarity of a solution made by dissolving 12.0 g NaCl in 0.500 L solution? (NaCl molar mass = 58.5 g/mol)

Accepted Answer

$$0.41\ 	ext{M}$$

Question 10

How many mL of 3.0 M HCl are needed to make 250 mL of 0.50 M HCl? (Use $$M_1V_1 = M_2V_2)$$

Accepted Answer

$$41.7\ 	ext{mL}$$

Question 11

Which of the following is a weak acid?

Accepted Answer

$$	ext{HNO}_2$$

Question 12

What is the concentration of chloride ions in a $$0.400\ 	ext{M}$$ $$	ext{CaCl}_2$$ solution?

Accepted Answer

$$0.800\ 	ext{M}$$

Question 13

In the reaction $$	ext{Zn} + 	ext{Cu}^{2+} ightarrow 	ext{Zn}^{2+} + 	ext{Cu}$$, which is the oxidizing agent?

Accepted Answer

$$	ext{Cu}^{2+}$$

Question 14

A reaction has a theoretical yield of 28.0 g but produces 21.6 g. What is the percent yield?

Accepted Answer

$$77.1\%$$

Question 15

If 3 L of $$	ext{N}_2$$ react with excess $$	ext{H}_2$$, how many liters of $$	ext{NH}_3$$ are produced? (Reaction: $$	ext{N}_2 + 3	ext{H}_2 ightarrow 2	ext{NH}_3)$$

Accepted Answer

$$6\ 	ext{L}$$

Question 16

What is the oxidation state of Cr in $$	ext{CrO}_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 17

A 3.10 g gas sample has a volume of 1.00 L at 2.10 atm and $$45^\circ	ext{C}. $$Determine the molar mass. (Use $$PV = nRT$$, $$R = 0.0821$$; choose the closest match: $$	ext{CO}_2$$, $$	ext{CH}_4$$, $$	ext{Ar}$$, $$	ext{NH}_3$$, $$	ext{NO})$$

Accepted Answer

$$	ext{Ar}$$

Question 18

How many mL of $$0.150\ 	ext{M}\ 	ext{H}_2	ext{SO}_4$$ are required to neutralize 35.0 mL of $$0.200\ 	ext{M}\ 	ext{KOH}$$? (Reaction: $$	ext{H}_2	ext{SO}_4 + 2	ext{KOH} ightarrow 2	ext{H}_2	ext{O} + 	ext{K}_2	ext{SO}_4)$$

Accepted Answer

$$23.3\ 	ext{mL}$$

Question 19

What volume of 3.0 M KCl is needed to prepare 250 mL of 0.75 M KCl? (Use $$M_1V_1 = M_2V_2)$$

Accepted Answer

$$62.5\ 	ext{mL}$$

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