Density Of an Ideal Gas

Overview

The density of an ideal gas is directly proportional to its molar mass. Increasing pressure leads to molecules coming closer together, resulting in higher density. Conversely, higher temperatures cause gases to expand, leading to a decrease in density.

Questions and Answers

  1. How does the density of an ideal gas change with an increase in pressure?

    The density of an ideal gas increases with an increase in pressure. This is because a higher pressure causes the gas molecules to come closer together, resulting in a higher density.

  2. Explain how the density of an ideal gas changes with an increase in temperature.

    An increase in temperature causes the gas molecules to move further apart, leading to a decrease in density. Therefore, as the temperature of an ideal gas increases, its density decreases.

  3. What happens to the density of an ideal gas when the volume is increased at constant temperature and pressure?

    When the volume of an ideal gas is increased at constant temperature and pressure, the density of the gas decreases. This is because the gas molecules have more space to move around, resulting in a lower density.

  4. How is the density of an ideal gas related to its molar mass?

    The density of an ideal gas is directly proportional to its molar mass. This means that gases with higher molar masses will have higher densities compared to gases with lower molar masses.

  5. What factors affect the density of an ideal gas?

    The density of an ideal gas is affected by pressure, temperature, and molar mass. An increase in pressure or molar mass leads to a higher density, while an increase in temperature results in a lower density.

Multiple-Choice Questions

  1. What is the density of CH4 gas at 0°C and 1 atmospheric pressure?

    a) 0.649 g dm-3
    b) 0.7138 g dm-3
    c) 1.427 g dm-3
    d) 1.315 g dm-3
    Answer: b) 0.7138 g dm-3

  2. If the temperature of CH4 gas is increased to 27°C, what will happen to its density?

    a) Increase
    b) Decrease
    c) Remain the same
    d) Double
    Answer: b) Decrease

  3. If the pressure is doubled and the temperature is halved for a gas, what will happen to its density?

    a) Increase
    b) Decrease
    c) Remain the same
    d) Double
    Answer: a) Increase

  4. If the temperature of O2 gas is increased by 100°C and the pressure is decreased by 100 torr, what will happen to its density?

    a) Increase
    b) Decrease
    c) Remain the same
    d) Double
    Answer: b) Decrease

  5. When the pressure on CH4 gas is increased to 2 atmospheres at 0°C, what will happen to its density?

    a) Increase
    b) Decrease
    c) Remain the same
    d) Double
    Answer: a) Increase