Derive the relationship between ΔH and ΔU for an ideal gas.

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TextEnthalpy of a System and Heat CapacityFirst Law of Thermodynamics

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If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1bar and 100°C is 41kJ mol–1. Calculate the internal energy change, when 1 mol of water is vapourised at 1 bar pressure and 100°C.

TextEnthalpy of a System and Heat Capacity

In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

TextFirst Law of Thermodynamics