Answer:
Exothermic. q = -542 kJ
Endothermic. q = 98.8 kJ
Explanation:
<em>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. </em>
<em>H₂(g) + F₂(g) ⇄ 2 HF(g) </em>
<em>Is this reaction endothermic or exothermic? What is the value of q?</em>
Since the heat is evolved, the reaction is exothermic. When the reaction is exothermic, q is negative, that is, q = -542 kJ.
<em>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</em>
<em>Fe₂O₃(s) + 3 H₂(g) ⇄ 2 Fe(s) + 3 H₂O(g) </em>
<em>Is this reaction endothermic or exothermic? What is the value of q?</em>
Since the heat is absorbed, the reaction is endothermic. When the reaction is endothermic, q is positive, that is, q = 98.8 kJ.