Given the three statements below, which answer is correct?
I. A thermochemical equation must include the physical state of all substances.
II. The coefficients in a thermochemical equation are interpreted as moles.
III. The sign of D H is negative for an endothermic reaction.

Question

Quizplus · Accepted Answer

Statement I is true because the physical state of all substances must be included in a thermochemical equation to accurately represent the reaction. Statement II is also true because the coefficients in a balanced equation represent the number of moles of each substance involved in the reaction. Statement III is false because DH is positive for an endothermic reaction, indicating that energy is absorbed from the surroundings. Thus, only statements I and II are true, while statement III is false.

Given the Three Statements Below, Which Answer Is Correct