Q 2622134931.     Answer the following in brief:
(a) Which of the two isomers of butane is more stable at 25°C and why?
Given [n-butane (`Δ_fH ^0 = −120 kJ mol^-1`) and iso-butane (`Δ_fH^0 = - 130 kJ mol^-1`)]

(b) For the change `H_2O (l) -> H_2O (g)`, predict the sign of ΔS.

(c) For the reaction `N_2(g) + 3H_2 (g) -> 2NH_3 (g)`, predict whether work is done by the system or on the system and why?

CBSE-12th 2006

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