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

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