Given that \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g),\Delta H=-394kJ\] \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l),\,\Delta H=568kJ\] \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\,\to \,\,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]\[\Delta H=-892\,kJ\] Heat of formation of \[C{{H}_{4}}\] is [DCE 1999]

Given that \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g),\Delta H=-394kJ\] \[2{

1.	Given that \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g),\Delta H=-394kJ\] \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l),\,\Delta H=568kJ\] \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\,\to \,\,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]\[\Delta H=-892\,kJ\] Heat of formation of \[C{{H}_{4}}\] is [DCE 1999]
A.	? 70 kJ
B.	71.8 kJ
C.	? 244 kJ
D.	+ 782 kJ
Answer» B. 71.8 kJ

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Given that \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g),\Delta H=-394kJ\] \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l),\,\Delta H=568kJ\] \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\,\to \,\,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]\[\Delta H=-892\,kJ\] Heat of formation of \[C{{H}_{4}}\] is [DCE 1999]

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