| (i) \[\operatorname{C}\left( s \right)+{{O}_{2}}\left( g \right)=C{{O}_{2}}\left( g \right)+97\,\,kcal\] |
| (ii) \[\operatorname{C}{{O}_{2}}\left( g \right) + C\left( s \right)=2CO\left( g \right) - 39 kcal\] kcal the heat of combustion of CO(g) is: |
A) 68 kcal
B) -68 kcal
C) +48 kcal
D) None
Correct Answer: A
Solution :
Subtracting equation (ii) from equation (i), we get \[C(s)+{{O}_{2}}(g)\,\,=\,\,C{{O}_{2}}(g)\,+\,\,97\,\,kcal\] \[C{{O}_{2}}\left( g \right)+ C\left( s \right)=2CO\left( g \right) - 39 kcal\] or, \[-C{{O}_{2}}\left( g \right) + {{O}_{2}}\left( g \right)=C{{O}_{2}}\left( g \right) - 2CO\left( g \right) +136 kcal\]\[\operatorname{or}, \,\,2CO\left( g \right) +{{O}_{2}} = 2C{{O}_{2}}\left( g \right) +136 kcal\] \[\operatorname{or}, CO\left( g \right) + 1/2\, {{O}_{2}}\left( g \right) = C{{O}_{2}}\left( g \right) + 68 kcal\] \[\operatorname{Required} value = 68 kcal\]
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