An engine takes in 5 moles of air at 20ºC and 1atm, and compresses it adiabatically to 1/10th of the original volume. Assuming air to be a diatomic ideal gas made up of rigid molecules, the change in its internal energy during this process comes out to be X kJ. The value of X to the nearest integer is________
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A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure and volume changes to final state at in an adiabatic quasi-static process, such that constant. Consider another thermodynamic process that brings the system form the same initial state to the same final state in two steps: an isobaric expansion at followed by an isochoric (is volumetric) process at volume. The amount of heat supplied to the system in the two-step process is approximately
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