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Heat of Reaction

How much amou...

Question

How much amount of heat will release when 100 g of $O_{2}$ is used to burn an excess of sulfur according to the following reaction?
$S (s) + O_{2} \to {S O}_{2} (g); Δ H = - 296 k J / m o l e$

925000 J

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29000 J

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1850 J

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296 J

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100 J

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Solution

The correct option is A 925000 J
1 mol of $O_{2}$ has $32$ gram.
So, $100$ gram has $\frac{100}{32} = 3.125$ moles.
Burning of $S$ with 1 mol of $O_{2}$ produces $296 k J$ energy.
So, 3.125 moles will produce $= 3.125 \times 296 k J = 925 k J = 925000 J$ .

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