Question

When 1 mole of H2(g) reacts with F2(g) to form HF(g) according to the following equation, 542 kJ of energy are evolved H2(g) + F2(g2HF(g) Is this reaction endothermic or exothermic? What is the value of q? kJ When 1 mole of Fe203(s) reacts with H2(g) to form Fe(s) and H20(g) according to the following equation, 98.8 kJ of energy are absorbed Fe2O3(s) +3H2(g)^2Fe(s) + 3H2Og) Is this reaction endothermic or exothermic? What is the value of q? kJ

Answer 1

Answer:

Exothermic. q = -542 kJ

Endothermic. q = 98.8 kJ

Explanation:

When 1 mole of H₂(g) reacts with F₂(g) to form HF(g) according to the following equation, 542 kJ of energy are evolved.

H₂(g) + F₂(g) ⇄ 2 HF(g)

Is this reaction endothermic or exothermic? What is the value of q?

Since the heat is evolved, the reaction is exothermic. When the reaction is exothermic, q is negative, that is, q = -542 kJ.

When 1 mole of Fe₂O₃(s) reacts with H₂(g) to form Fe(s) and H₂0(g) according to the following equation, 98.8 kJ of energy are absorbed

Fe₂O₃(s) + 3 H₂(g) ⇄ 2 Fe(s) + 3 H₂O(g)

Is this reaction endothermic or exothermic? What is the value of q?

Since the heat is absorbed, the reaction is endothermic. When the reaction is endothermic, q is positive, that is, q = 98.8 kJ.