Question

question 21 of 25
what can be said about the reaction 2nh₃(g) → n₂(g) + 3h₂(g), δh = 92.4 kj/mol?
a. the forward direction is favored.
b. the reaction is exothermic.
c. the reaction produces heat.
d. the reaction is endothermic.

Explanation:

Step1: Understand enthalpy sign meaning

If $\Delta H> 0$, heat is absorbed. If $\Delta H < 0$, heat is released.

Step2: Analyze given $\Delta H$ value

Given $\Delta H = 92.4$ kJ/mol, which is positive.

Step3: Determine reaction type

A positive $\Delta H$ indicates an endothermic reaction. An endothermic reaction absorbs heat rather than producing heat (which is exothermic). Whether the forward - direction is favored depends on other factors like entropy and temperature, not just $\Delta H$.

Answer:

D. The reaction is endothermic.