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Heat of Formation

What will be ...

Question

What will be the heat of formation of methane, if the heat of combustion of carbon is '-x' KJ, heat of formation of water is '-y' KJ and heat of combustion of methane '-Z' KJ?

(-x - y - z)

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(-z - x + 2y) KJ

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(-x - 2y - z) KJ

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(-x - 2y + z) KJ

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Solution

The correct option is D
(-x - 2y + z) KJ

The given reactions are as follows:
$C + O_{2} ⟶ C O_{2} - x K J - - - - - - (i) H_{2} + \frac{1}{2 O_{2}} ⟶ H_{2} O - y K J - - - - - - (i i)$
$C H_{4} + 2 O_{2} ⟶ C O_{2} + 2 H_{2} O - z K J - - - - - - (i i i)$
By manipulating equations in the manner (i) + 2(ii) - (iii) we get

= (-x - 2y + z) KJ

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Similar questions

- x

k J

- y

k J

- z

k J

^{'} - x^{'} k J

^{'} - y^{'} k J

^{'} z^{'} k J

= - 286 k J {m o l}^{- 1}

= - 890 k J {m o l}^{- 1}

= - 393.5 k J {m o l}^{- 1}

1410.0 k J . m o l^{- 1}

C O_{2}

H_{2} O

393.3 k J

286.2 k J

- 800

4 \times 10^{- 4}

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