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24 September, 20:26

Which of the following is always valid? Choose only ONE answer.

1. W = - P ∫ dV, for the calculation of work in a mechanically-reversible piston-cylinder arrangement

2. For any fluid undergoing a change in pressure, Cp = dH/dT.

3. ΔH = ΔU + Δ (PV)

4. ΔU = Q + W

5. ΔH = ΔU + P.ΔV

+4
Answers (1)
  1. 24 September, 22:09
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    4. ΔU = Q + W

    Explanation:

    Equation 4 corresponds to the definition of internal energy of a substance as part of a system. This equation is always valid and is fulfilled in all types of systems and refers to the known phrase:

    "energy is neither created nor destroyed, transformed" ... First Law of Thermodynamics
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