Answer:
If the gases are at equal pressure, the gas at higher temperature will be less dense. If the gases are at the same temperature, the gas at higher pressure will be more dense. If two gases of different molecular weights are at the same pressure and temperature in containers of equal size, then the high molecular weight gas will be more dense.
Explanation:
The density of a gas decreases with increase in temperature at constant pressure. This is because, when a gas is heated, the kinetic energy of its molecules increases, the molecules move faster, bump into each other, and spread apart and therefore the volume of the gas increases. Since the gas molecules are now more spaced out, the density of the gas decreases.
The density of a gas has a direct relationship with pressure. The density of a gas increases with increases in pressure at constant temperature. This is because, when the pressure of a gas is increased, the space between the molecules decreases as they are forced to become more crowded together, as such the volume ofmthe gas decreases. The density of the gas will then increase.
The molecular weight of a gas is directly proportional to its density. Hence, gases of low molecular weight has lower densities while gases of high molecular weight have higher densities.
Hence, If the gases are at equal pressure, the gas at higher temperature will be less dense. If the gases are at the same temperature, the gas at higher pressure will be more dense. If two gases of different molecular weights are at the same pressure and temperature in containers of equal size, then the high molecular weight gas will be more dense.
