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Select the correct formula about the change in enthalpy.

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$Δ_{r} H = (Sum of enthalpies of reactants) - (sum of enthalpies of products)$

$Δ_{r} H = (Sum of enthalpies of products) - (sum of enthalpies of reactants)$

$Δ_{r} H = (Difference of enthalpies of products) - (Difference of enthalpies of reactants)$

$Δ_{r} H = (Difference of enthalpies of reactants) - (Difference of enthalpies of products)$

answer is B.

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Detailed Solution

The enthalpy change of a chemical reaction is given by the symbol $Δ_{r} H$

$Δ_{r} H = sum of enthalpies of products - sum of$ $enthalpies of reactants = \sum_{i} a_{i} H_{products} - \sum_{i} b_{i} H_{reactants}$

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