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Which statement is true if the mc001-1.jpgHrxn of a reaction is positive? The reaction is endothermic. The reaction is exothermic. There is more reactant than product. There is more product than reactant.

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The answer is A.( The reaction is endothermic) I had it on my test and got it right 

The enthalpy change of a reaction is given as the difference in enthalpies of the products and reactants i.e.

ΔHrxn = ∑ΔH⁰f (products) - ∑ΔH⁰f(reactants)

If ΔH°f(products) > ΔH°f(reactants) then the value of the enthalpy change for the reaction ΔHrxn is positive.

Reactions which show a positive value of ΔHrxn proceed with the absorption of heat and are called as endothermic reactions.



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