A) \[-196\text{ }k\text{ }J/mol\]
B) \[+\text{ }196\text{ }k\text{ }J/mol\]
C) \[+948\text{ }k\text{ }J/mol\]
D) \[-948\text{ }k\text{ }J/mol\]
Correct Answer: A
Solution :
\[2{{H}_{2}}{{O}_{2}}(l)\xrightarrow{{}}2{{H}_{2}}{{O}_{2}}(l)+{{O}_{2}}(g)\Delta H=?\] |
\[\Delta H=[2\times \Delta {{H}_{f}}\,\text{of}\,{{H}_{2}}O(l)+(\Delta {{H}_{f}}\,\text{of}\,{{O}_{2}})]\] |
\[-(2\times \Delta {{H}_{f}}\,\text{of}\,{{H}_{2}}{{O}_{2}}(l))]\] |
\[=[(2\times -286)+(0)-(2\times -188)]\] |
\[=[-572+376]\] |
\[=-196\,\,kJ\,/mol\] |
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