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C(("graphite")) + H2O((g)) to CO((g)) + ...

`C_(("graphite")) + H_2O_((g)) to CO_((g)) + H_(2(g))`,
`DeltaH = +131.4 kJ.` (Assume reaction occures at STP) How much energy is absorbed when one litre of hydrogen gas is formed at STP ? 

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The heat of reaction, `DeltaH= + 131.4 kJ`.
It indicates that formation of one mole of hydrogen involve absorption of 131.4 kJ of heat. One mole gas at STP has a volume of 22.4 L. Formation of 22.4 litre of hydrogen gas absorbs 131.4 kJ. Formation of one litre 3 of hydrogen gas absorbs 5.87 kJ.
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