A piston-cylinder assembly with the piston resting on a set of stops, contains 0.5 Kg of He gas intially at 100kPa and 25C. The mass of the piston and the effect of the atmospheric pressure is such that a pressure of 500kPa is required to raise it. How much energy must be transferred by heat to the He in kJ, before the piston starts rising?

Question

A piston-cylinder assembly with the piston resting on a set of stops, contains 0.5 Kg of He gas intially at 100kPa and 25C.  The mass of the piston and the effect of the atmospheric pressure is such that a pressure of 500kPa is required to raise it.  How much energy must be transferred by heat to the He in kJ, before the piston starts rising?
Assume ideal gas