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Standard XII

Chemistry

Heat of Reaction

2H2g+O2g→ 2H2...

Question

$2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (g) + 483.6$ kJ
With the help of above equation calculate the amount of heat energy which will be released when $8$ grams of hydrogen are burned?

241.8

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483.6

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967.2

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1.934

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3.869

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Solution

The correct option is C $967.2$ kJ
When $2$ moles of $H_{2} (4 g)$ is burned, amount of heat released= $483.6 k J$
$2 \to 483.6 k J$
When $8 g$ of Hydrogen i.e. $4$ moles of $H_{2}$ is burned, amount of heat released= $x$
$2 \to 483.6$
$4 \to x$
$x = 967.2 k J$
Hence, $967.2 k J$ of heat will release.

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