# Gas Laws 2 (Worksheet)

#### Q1

A sample of 6.9 moles of gas is placed in a container of volume of 30.4 L. What is the pressure of the gas in torr if the gas is at 62^{o}C? What would be the volume of this gas if placed at STP?

#### Q2.

A 2.1 L flask contains 4.65 g of gas at 1 atm and 27^{o}C, what is the density and molar mass of the gas?

#### Q3.

A mixture of helium and neon gases is collected over water at 28^{o}C and 456 mmHg. If the partial pressure of \(He\) is 240 mmHg, what is the partial pressure of neon? (vapor pressure of water at 28^{o}C is 28.3 mmHg)

#### Q4

A gas mixture contains three components: 28 g \(CO\), 2.0 g \(H_2\) and 8.0 g of \(O_2\). If the gases are at STP, what are the partial pressures of each gas? What is the total volume?

#### 5.

Given the equation:

\(Zn_{(s)} + 2HCl_{(aq)} \rightarrow ZnCl_{2\,(aq)} + H_{2\,(g)}\)

If 520 mL of \(H_2\) is collected over water at 28^{o}C and the atmospheric pressure is 1.0 atm, how many g of \(Zn\) was used at the start of the reaction? (vapor pressure of water at 28^{o}C is 28.3 mmHg).

#### Q6

A sample of 2.0 moles of hydrogen gas is placed in a container with a volume of 10.4 L. What is the pressure of the gas in torr if the gas is at 25^{o}C?

#### Q7

A 2.4 L sample of gas is placed in a container at 25^{o}C and 2 atm of pressure. If the temperature is raised to 50^{o}C and the volume is changed to 5.6 L, what is the new pressure?

#### Q8

A gas is placed in a balloon with a volume of 3.0 L at 35^{o}C and 800 torr. What would be the new volume for the gas if placed under STP?

#### Q9

How many moles of gas would occupy a volume of 22.4 L at a pressure of 745 torr and a temperature of 26^{o}C?

#### Q10

Calculate the volume of 10.8 g of \(CO_2\) at STP.

#### Q11

Calculate the volume of 0.681 g of \(N_2\) at STP.

#### Q12

A gas at 772 mmHg and 35^{o}C occupies a volume of 6.85 L, calculate its volume if the temperature is raised to 50^{o}C at a constant pressure.

#### Q13

Drano uses a mixture of sodium hydroxide and aluminum powder to generate hydrogen gas and heat when placed in a drain. Calculate the volume of \(H_2\) produced at STP if 3.12 g of \(Al\) is used. (Mole ratio is \(3H_2\) to \(2Al\)).

#### Q14

A piece of sodium metal undergoes complete reaction with water as follows:

\[2Na_{(s)} + 2H_2O_{(l)} \rightarrow 2NaOH_{(aq)} + H_{2\,(g)}\]

The hydrogen gas is collected over water at \(25^oC\). The volume of gas is 246 mL measured at 1 atm. Calculate the number of grams of \(Na\) used in the reaction. (vapor pressure of water = 0.0313 atm)