Question

Which statement is true if the Hrxn of a reaction is positive?
A.)The reaction is endothermic.
B.)The reaction is exothermic.
C.)There is more reactant than product.
D.)There is more product than reactant.

Answer 1

Answer: The correct answer is Option A.

Explanation:

Endothermic reactions are defined as the reactions in which potential energy of the reactants is less than the potential energy of the products. The total enthalpy change of the reaction $(\Delta H_{rxn})$ comes out to be positive. Energy is absorbed during this reaction.

$\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}=+ve$

Exothermic reactions are defined as the reactions in which potential energy of the products is less than the potential energy of the reactants. The total enthalpy change of the reaction $(\Delta H_{rxn})$ comes out to be negative. Energy is released during this reaction.

$\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}=-ve$

From the above information, the correct answer is Option A.