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  4. The combustion enthalpy of carbon, hydrogen and methane are -393.5;-284.8 and -890.4kJ/mole respectively at 25° C . The value of standard formation enthalpies of methane at that temperature is :-

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Q. The combustion enthalpy of carbon, hydrogen and methane are $-393.5;-284.8$ and $-890.4kJ/mole$ respectively at $25^\circ C$ . The value of standard formation enthalpies of methane at that temperature is :-

NTA AbhyasNTA Abhyas 2020

Solution:

$C+2H_{2} \rightarrow CH_{4}$
$ΔH_{R}=\Delta _{C}H_{C}+2\times \Delta _{C}H_{H_{2}}-\Delta _{C}H_{CH_{4}}$