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

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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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

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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