When 1 mole of P 4 O 10 (s) reacts with H 2 O(l) to form H 3 PO 4 (aq) according
ID: 840467 • Letter: W
Question
When 1 mole of P4O10(s) reacts with H2O(l) to form H3PO4(aq) according to the following equation, 453 kJ of energy are evolved.
Is this reaction endothermic or exothermic? _________endothermicexothermic
What is the value of q? _______kJ
When 2 moles of NO(g) react with H2(g) to form N2(g) and H2O(l) according to the following equation, 752 kJ of energy are evolved.
Is this reaction endothermic or exothermic? _________endothermicexothermic
What is the value of q? _______kJ
When 1 mole of H2S(g) reacts with H2O(l) to form H2(g) and SO2(g) according to the following equation, 295 kJ of energy are absorbed.
Is this reaction endothermic or exothermic? _________endothermicexothermic
What is the value of q? _______kJ
Explanation / Answer
(1) P4O10(s) + 6 H2O(l) => 4 H3PO4(aq)
Since heat is evolved => reaction is exothermic
q is negative => q = -453 kJ
(2) 2 NO(g) + 2 H2(g) => N2(g) + 2 H2O(l)
Since heat is evolved => reaction is exothermic
q is negative => q = -752 kJ
(3) H2S(g) + 2 H2O(l) => 3 H2(g) + SO2(g)
Since heat is absorbed => reaction is endothermic
q is positive => q = +295 kJ
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