Ncert Exercises & Solutions

$∆_{f} U^{⊝}$ of formation of ${CH}_{4} (g)$ at certain temperature is $- 393$ $kJ$ ${mol}^{- 1}$ . The value of $∆_{f} H^{⊝}$ is-

1. Zero

2. $< ∆_{f} U^{⊝}$