Thermochemical reactions C( graphite ) + 1 2 O_2 (g) CO(g); , H =… - Vidyadip

MCQ

Thermochemical reactions $C({\rm{graphite}}) + \frac{1}{2}{O_2}(g) \to CO(g);\,\Delta H = - 110.5\,kJ$ $CO(g) + \frac{1}{2}{O_2}(g) \to C{O_2}(g);\,\Delta H = - 283.2\,kJ$ From the above reaction, the heat of reaction for $C({\rm{graphite}}) + {O_2}(g) \to C{O_2}(g)$ will be ........$kJ$

✓
$-393.7$
B
$+ 393.7$
C
$-172.7$
D
$+ 172.7$

✓

Answer

Correct option: A.

$-393.7$

(a)eq. $(i ) + $ eq. $(ii ) $ gives the required result.

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