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

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.