Why is the pressure of a given amount of gas increased when the temperature of the gas is raised at constant volume?

If the pressure of a certain amount of a gas is doubled keeping the temperature constant, what would be the volume of, the gas?

310 J of heat is required to raise the temperature of 2 moles of an ideal gas at constant pressure from 25^(@)C to 35^(@)C .The amount of heat required to raise the temperature of the gas through the same range at constant volume is

310 J of heat is required to rise the temperature of 2 moles of an ideal gas at constant pressure from 25^(@)C to 35^(@)C . The amount of heat required to raise the temperature of the gas through the same range at constant volume, is