MCQ
Which of the following reaction can be used to define the heat of formation of $C{O_2}(g)$
  • $C{\rm{(graphite)}} + {O_2}(g) = C{O_2}(g)$
  • B
    $C{H_4}(g) + 2{O_2}(g) = C{O_2}(g) + 2{H_2}O(l)$
  • C
    $CO(g) + \frac{1}{2}{O_2}(g) = C{O_2}(g)$
  • D
    ${C_6}{H_6}(l) + 7\frac{1}{2}{O_2}(g) = 6C{O_2} + 3{H_2}O(l)$

Answer

Correct option: A.
$C{\rm{(graphite)}} + {O_2}(g) = C{O_2}(g)$
(a)By definition of heat of formation.

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