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Sagot :
The option A describes an exothermic reaction.
i.e, ΔHt,reactant > ΔHt, product
What is exothermic reaction?
The reaction in which energy is release during the formation of reaction is called exothermic reaction.
Mathematically,
ΔHf = ΔH(product) - ΔH(reactant)
For exothermic reaction, ΔHt,reactant > ΔHt, product
So,for exothermic reaction, ΔHf is negative.
Where,
ΔHf = Enthalpy of formation of reaction
ΔH(product) = enthalpy of formation of product
ΔH(reactant) = enthalpy of formation of reactant
To learn more about exothermic reaction here.
https://brainly.com/question/10373907
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