Question

question 9 (1 point)
4 ph₃ + 2 h₂ + 9 o₂ ↔ 2 p₂o₅ + 8 h₂o(liq) + 25 kj
the reaction is endothermic or exothermic ? 1
the reaction gives off heat or absorbs heat ? 2
a. exothermic b. endothermic c. absorbs heat d. gives off heat
e. none of these choices f. exergonic g. endergonic h. δg = - 25 kj
i. δg = + 25 kj j. spontaneous k. non - spontaneous

Explanation:

Step1: Analyze reaction heat direction

In the reaction equation, 25 kJ is on the product side (right side), meaning heat is released (given off) during the reaction. Exothermic reactions release heat (heat as product), endothermic absorb (heat as reactant). So for the first blank (endothermic or exothermic), it's exothermic (A). For the second blank (gives off or absorbs heat), since heat is a product, the reaction gives off heat (D).

Answer:

1. A. exothermic
2. D. gives off heat