Chemical Engineering - MCQ Practice Questions

At high pressures, molecular volume effect (b term) dominates, making Z > 1. At moderate pressures, Z < 1 due to intermolecular attractions.

At constant pressure: ΔH = Q_p (definition of enthalpy). From ΔU = Q - W and W = PΔV, we get Q = ΔH.

Entropy is a state function. ΔS is path-independent and same for all processes (reversible or irreversible) between fixed states.