question_answer

\[C+\frac{1}{2}{{O}_{2}}\to CO;\,\Delta H=-42\,kJ\]                 \[CO+\frac{1}{2}{{O}_{2}}\to C{{O}_{2}};\,\Delta H=-24\,kJ\]                 The heat of formation of \[C{{O}_{2}}\] is                             [CPMT 1996]

A)                 ? 16 kJ  

B)                 + 66  kJ

C)                 + 16 kJ  

D)                 ? 66  kJ