Question

question 11 of 30 the enthalpy of a reaction is -1207 kj/mol. which of the following best describes this reaction? a. endothermic b. exothermic c. spontaneous d. nonspontaneous

Explanation:

1. Recall the definitions:

• Endothermic reactions have positive enthalpy change ($\Delta H>0$) as they absorb heat.
• Exothermic reactions have negative enthalpy change ($\Delta H < 0$) as they release heat.
• Spontaneity depends on Gibbs free energy ($\Delta G=\Delta H - T\Delta S$), not just enthalpy. A negative enthalpy alone doesn't guarantee spontaneity, and a negative enthalpy doesn't mean non - spontaneous.

1. Given $\Delta H=- 1207\space kJ/mol$ (negative), so the reaction releases heat, which is characteristic of an exothermic reaction.

Answer:

B. Exothermic