A) \[-142.5\,\,kJ\]
B) \[+\,142.5\,kJ\]
C) \[-285\,kJ\]
D) \[+\,285\,kJ\]
Correct Answer: C
Solution :
For the decomposition of 9 gm of water heat required \[=142.5\,\text{kJ}\] We know that the molecular weight of \[{{H}_{2}}O=2+16=18\] Therefore, heat required for decomposition of 18 gm of water \[=\frac{18}{9}\times 142.5=285\,kJ\] Therefore, enthalpy of formation of water \[=-285\,kJ\]
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