The free energy change for the following reactions are given belo… - Vidyadip

MCQ

The free energy change for the following reactions are given below,${C_2}{H_2}(g) + \frac{5}{2}{O_2}(g)\, \to $$2C{O_2}(g) + {H_2}O(l);\,\Delta {G^o} = - 1234\,kJ$ $C(s) + {O_2}(g)\, \to C{O_2}(g)\,\,\Delta {G^o} = - 394\,kJ$${H_2}(g) + \frac{1}{2}{O_2}(g)\, \to \,{H_2}O(l)\,\,\,\Delta {G^o} = - 237\,kJ$

What is the standard free energy change for the reaction ${H_2}(g) + 2\,C\,(s) \to {C_2}{H_2}(g)$ .....$kJ$

A
$-209$
B
$-2259$
C
$+ 2259$
✓
$209$

✓

Answer

Correct option: D.

$209$

(d)By $2× (ii) -(i) -(iii)$
${H_{2(g)}} + 2{C_{(s)}} \to {C_2}{H_{2(g)}},\,\,\,\Delta {G^o } = 209\,kJ$.

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