CHE 105/110 Introduction to Chemistry - Exercises and Answers

1.

What is the total pressure of a gas mixture containing these partial pressures: $P_{{\text{N}}_2}=0.78\text{atm}$, $P_{{\text{H}}_2}=0.33\text{atm}$, and $P_{{\text{O}}_2}=1.59\text{atm}$?

1.

2.70 atm

3.

In a gas mixture of He and Ne, the total pressure is 335 torr and the partial pressure of He is 0.228 atm. What is the partial pressure of Ne?

3.

162 torr, or 0.213 atm

5.

A 3.55 L container has a mixture of 56.7 g of Ar and 33.9 g of He at 33°C. What are the partial pressures of the gases and the total pressure inside the container?

5.

P_Ar = 10.0 atm; P_He = 59.9 atm; P_tot = 69.9 atm

7.

A sample of O₂ is collected over water in a 5.00 L container at 20°C. If the total pressure is 688 torr, how many moles of O₂ are collected?

7.

0.183 mol

9.

A sample of CO is collected over water in a 25.00 L container at 5°C. If the total pressure is 0.112 atm, how many moles of CO are collected?

9.

0.113 mol

11.

A sample of NO is collected over water in a 75.0 mL container at 25°C. If the total pressure is 0.495 atm, how many grams of NO are collected?

11.

0.0440 g

13.

Determine the mole fractions of each component when 44.5 g of He is mixed with 8.83 g of H₂.

13.

${\chi }_{\text{He}}=0.\text{718}$; ${\chi }_{{\text{H}}_{\text{2}}}=0.\text{282}$

15.

In a container, 4.56 atm of F₂ is combined with 2.66 atm of Cl₂. What are the mole fractions of each component?

15.

${\chi }_{{\text{F}}_{\text{2}}}=0.\text{632}$; ${\chi }_{{\text{Cl}}_{\text{3}}}=0.\text{368}$