A) \[445kJ\]
B) \[278kJ\]
C) \[-890kJ\]
D) \[178kJ\]
Correct Answer: D
Solution :
The combustion of methane can be represented by the following equation: \[\underset{12+4=16}{\mathop{C{{H}_{4}}}}\,+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}+2{{H}_{2}}O+890kJ\] \[\because \] \[16gC{{H}_{4}}\] burns in air to liberate \[=890\text{ }kJ\] of heat \[\therefore \] \[3.2g\text{ }C{{H}_{4}}\]will liberate \[=\frac{890\times 3.2}{16}\] \[=178\text{ }kJ\]of heat
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