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Question

Chemistry Question on Enthalpy change

Based on the first law oi thermodynamics, which one of the following is correct?

A

For an isothermal process, Q=+wQ=+w

B

For an isochoric process, ΔU=Q\Delta U=-Q

C

For an adiaoatic process, ΔU=W\Delta\,U =-W

D

For a cyclic process, Q=wQ =-w

Answer

For a cyclic process, Q=wQ =-w

Explanation

Solution

According to first law of thermodynamics, ΔU=Q+W\Delta U=Q+W For cyclic process, change in internal energy =0=0 Q=W\therefore Q=-W