There is gas in a gas container. A valve on the container will be opened and a half of the gas quantity will be released to the outer range. Due to this process the temperature of the gas will be decreased by 25%. What is the decrease of the gas pressure?

The pressure of an ideal gas is slowly increased to double its original pressure with no change in temperature.  What happens to the volume?    It does not change.      It halves.      It quadruples.      It doubles.

What is the mass of the helium gas in the previous problem? The molar mass of helium gas is 4.00 g/mol.

The number of collisions between helium atoms with the walls of the container per unit time is... A. Fixed when added CO2 gas into the container at a constant temperatureB. Decreases when the container is reduced in halfC. Increases in size when the temperature dropsD. Decreases as the average kinetic energy per molecule increasesE. Increases in size when CO2 is added to a container at a constant temperature