gonzalezchava20 gonzalezchava20

06-06-2017
Chemistry

contestada

Reactions that are exothermic have ΔHf values that are positive or negative

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dec77cat dec77cat

06-06-2017

The enthalpy change of an exothermic reaction has a negative value.

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BarrettArcher BarrettArcher

12-02-2019

Answer : The reactions that are exothermic have [tex]\Delta H_f[/tex] values that are negative.

Explanation :

Exothermic reaction : When system releases heat energy to surrounding is known as exothermic reaction.

Endothermic reaction : When system absorbs heat energy from surrounding is known as endothermic reaction.

Enthalpy of reaction, [tex](\Delta H)[/tex] : It is defined as the heat energy changes when the reactants go to the products.

If the heat energy is released then the reaction is exothermic and the [tex](\Delta H)[/tex] is negative that means product is more stable than the reactant.

If the heat energy is absorbed then the reaction is endothermic and the [tex](\Delta H)[/tex] is positive that means product is less stable than the reactant.

Hence, the reactions that are exothermic have [tex]\Delta H_f[/tex] values that are negative.

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