Engineering Thermodynamics
The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)

mcp (T2 + T1)
mcp (T2 - T1)
mcv (T2 - T1)
mR (T2 - T1)

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Engineering Thermodynamics
An isolated system is one in which

Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so

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