A) \[-809.5\text{ }kJ\text{ }mo{{l}^{-1}}\]
B) \[-890\text{ }kJmo{{l}^{-1}}\]
C) \[809\text{ }kJ\,mo{{l}^{-1}}\]
D) \[-971\text{ }kJ\,mo{{l}^{-1}}\]
Correct Answer: A
Solution :
[a] \[C{{H}_{4}}\left( g \right)+2{{O}_{2}}\left( g \right)\xrightarrow{{}}C{{O}_{2}}\left( g \right)+2{{H}_{2}}O\left( l \right)\] \[\Delta H=-890\text{ }kJ\] .... (i) \[2{{H}_{2}}O\left( l \right)\xrightarrow{{}}2{{H}_{2}}O\left( g \right);\] \[\Delta H=2\times 40.5=81\text{ }kJ\] .... (ii) From (i) + (ii), we get \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}\left( g \right)+2{{H}_{2}}O\left( g \right)\] \[\Delta H=-890+81=-809kJ\]You need to login to perform this action.
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