Heat of a reaction $(Q)$ at constant pressure is equal to:

E_{P} - E_{R}

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E_{R} - E_{P}

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H_{P} - H_{R}

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H_{R} - H_{P}

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Solution

The correct option is C $H_{P} - H_{R}$
Heat of a reaction at constant pressure $= Δ H$
$=$ $\sum H$ (products) - $\sum H$ (reactants) $= H_{P} - H_{R}$

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