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Heat Capacity at Constant Pressure

Values of hea...

Question

Values of heats of formation for ${S i O}_{2}$ and $M g O$ are $- 48.4$ and $- 34.7 K J$ respectively. The heat of the reaction
$2 M g + {S i O}_{2} \to 2 M g O + S i$ is:

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Solution

$2 M g + S i O_{2} \to 2 M g O + S i$
$△_{f} H = 2 {(△_{f} H)}_{M g O} - {(△_{f} H)}_{S i O_{2}}$
$= (- 2 \times 34.7) + (48.4)$
$∴ △_{f} H = - 21 K J$

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