JEE AdvancedThermodynamicsHard

Question

In which of the following reaction, ᐃH > ᐃU ?

Options

A.H2(g) + I2(g) → 2HI(g)
B.PCl5(g) →  PCl3(g) + Cl2(g)
C.2H2O(l) → 2H2O(l) + O2(g)
D.C(s) + O2(g) → CO2(g)

Solution

ᐃH = ᐃU + ᐃnRT, where ᐃn = nP - nR            (n = number of moles)

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