Calculate the heat of formation of methane, given that
heat of formation of water $= - 286 k J {m o l}^{- 1}$
heat of combustion of methane $= - 890 k J {m o l}^{- 1}$
heat of combustion of carbon $= - 393.5 k J {m o l}^{- 1}$

75.5 k J {m o l}^{- 1}

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- 75.5 k J {m o l}^{- 1}

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- 55.5 k J {m o l}^{- 1}

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55.5 k J {m o l}^{- 1}

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Solution

The correct option is B $- 75.5 k J {m o l}^{- 1}$
Heat of formation of methane = 2 $\times$ heat of formation of water + heat of combustion of carbon - heat of combustion of methane
Heat of formation of methane = $2 * (- 286) + (- 393.5) - (- 890)$ = $- 75.5 K J m o l^{- 1}$

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