Answer the following in brief: (a) Which of the two isomers of butane is more stable at 25°C and why? Given [n-butane

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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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