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Stoichiometry

The value of ...

Question

The value of $Δ H_{O - H}$ is $109 k c a l$ ${m o l}^{- 1}$ . The formation of one mole of water in gaseous state from $H (g)$ and $O (g)$ is accompanied by:

A

218 k c a l

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B

- 109 k c a l

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C

- 218 k c a l

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D

Unpredictable

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Solution

The correct option is C $- 218 k c a l$
The involved reaction is,
$2 H (g) + O (g) \to H_{2} O (g)$ => $Δ H = - 2 \times Δ H_{O - H}$
Hence, formation of one mole of water in gaseous state from H(g) and O(g) is accompained by,
$Δ H = - 2 \times 109 = - 218 Kcal$
Hence, the answer is option C.

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Q. Compute the enthalpy of formation of liquid methyl alcohol in kJ

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{C H}_{3} O H = 38 k J / m o l

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