A fixed amount of ideal gas is held in a rigid container that expands negligibly when heated. At 20°C the gas pressure is P. If we add enough heat to increase the temperature from 20°C to 40°C, the pressure will be:

Aequal to 2P

Bless than 2P

Cimpossible to determine since we do not know the number of moles of gas in the container

Dgreater than 2P

or

Eimpossible to determine since we do not know the volume of gas in the container.