A pistoncylinder assembly contains 1 kg of a substance at 10

A piston-cylinder assembly contains 1 kg of a substance at 100 KPa. The initial volume is 0.5 m^3. Heat is transferred to the substance in an amount necessary to cause a slow expansion at constant temperature. This process is terminated when the final volume is twice the initial volume. Determine the magnitude of the heat transfer required if the substance is Nitrogen Water.