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Heat of Formation

In the follow...

Question

In the following reaction, which compound/s corresponds to $(X)$ ?
$C a C_{2} + 2 H_{2} O \to C_{2} H_{2} + (X)$

C a O H

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C a (O H)_{2}

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C a O + H_{2}

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none of the above

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Solution

The correct option is B $C a (O H)_{2}$
Hydrolysis of calcium carbide:
$C a C_{2} \to C a + 2 C$
$C a O + H_{2} O \to C a (O H)_{2}$
$2 C O_{2} + H_{2} O \to C_{2} H_{2} + \frac{5}{2} O_{2}$
$C a + \frac{1}{2} O_{2} \to C a O$
$2 C + 2 O_{2} \to 2 C O_{2}$
--------------------------------------------------------------------------------------------------
$C a C_{2} (s) + 2 H_{2} O (l) \to C_{2} H_{2} (g) + C a (O H)_{2} (a q)$

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