MCQ
Consider the following reaction
$C(s) + O_2(g) \to CO_2(g) + x\ kJ$
$CO(g) + \frac {1}{2}O_2(g) \to CO_2(g) + y\,kJ$
The heat of formation of $CO(g)$ is
- A$-(x + y)\,kJ/mol$
- B$(x - y)\,kJ/mol$
- ✓$(y - x)\,kJ/mol$
- DNone of these
✓
Answer
Correct option: C.
$(y - x)\,kJ/mol$
c
$C(s) + {O_2}(g) \to C{O_2}(g)$
$C(s) + {O_2}(g) \to C{O_2}(g)$
${{\Delta _{\text{r}}}{{\text{H}}_1} = - {\text{x}}\,{\text{kJ}}/{\text{mol}}}......(1)$
${\text{CO}}({\text{g}}) + 1/2{{\text{O}}_2}({\text{g}}) \to {\text{C}}{{\text{O}}_2}({\text{g}})$
${\Delta _{\text{r}}}{{\text{H}}_2} = - {\text{y}}\,{\text{kJ}}/{\text{mol}}......(2)$
Equation $(1) - (2)$
${\text{C}}({\text{s}}) + \frac{1}{2}{{\text{O}}_2}({\text{g}}) \to {\text{CO}}({\text{g}})$
${\Delta _f}H = (y - x)\,kJ/mol$
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