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Heat of Formation

The heat of f...

Question

The heat of formation of $C O_{2} (g)$ is -394 kJ/mole and that of $H_{2} O (l)$ is -286 kJ/mole. The heat of combustion of $C_{2} H_{4}$ is -1412 kJ/mole. What is the heat of formation of $C_{2} H_{4}$ ?

$C_{2} H_{4} (g) + 3 O_{2} (g) \to 2 C O_{2} (g) + 2 H_{2} O (l)$

+ 1360

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- 108

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+ 52

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+ 108

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Solution

The correct option is C $+ 52$
Heat of a reaction = heat of formation of products - heat of formation of reactants
here,

$C_{2} H_{4} + 3 O_{2} \to 2 C O_{2} + 2 H_{2} O$

so heat of reaction :

$- 1412 = (- 2 \times 394) - (286 \times 2$ ) - heat of formation of $C_{2} H_{4}$ - 0

heat of formation of $C_{2} H_{4}$ = $52 k J / m o l$

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Similar questions

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