Question

For a fixed volume of gas at a fixed temperature, what will happen if the amount (number of moles) is doubled?

Answer 1

The pressure of the gas will be doubled.

Explanation:

Pressure of a gas is caused by collisions of molecules with the walls of the container. So if the number of molecules is doubled in a container , there will be more frequent collisions between the molecules of gas and container wall, as a result the pressure in the container will be doubled if the temperature and volume remain constant. According to Avogadro's law : pressure of a system is directly proportional to the number of molecules if volume and temperature remain constant.