A) \[(-x-y+z)\,kJ\]
B) \[(-z-x+2y)\,kJ\]
C) \[(-x-2y-z)\,kJ\]
D) \[(-x-2y+z)\,kJ\]
Correct Answer: D
Solution :
[d] From given data, we have \[C+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}-x\,kJ\] ? (i) \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}{{H}_{2}}O-y\,kJ\] ? (ii) \[C{{H}_{4}}+2{{O}_{2}}\xrightarrow{{}}C{{O}_{2}}+2{{H}_{2}}O+z\,kJ\] ? (iii) The required equation is \[C+2{{H}_{2}}\xrightarrow{{}}C{{H}_{4}}+Q\] To get the required equation, operate \[(i)+2\times (ii)-(iii)\] Thus, we get \[C+2{{H}_{2}}\xrightarrow{{}}C{{H}_{4}}+[(-x)+(-2y)-(-z)]\] Thus, heat of formation of methane is \[(-x-2y+z)\,kJ\]
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