How much heat is given off when 8 g of hydrogen reacts in: 2H₂ + O₂ → 2H₂O; ΔH = -115.60 kcal a. -57.8 kcal b. -115.6 kcal c. -173.4 kcal d. -231.2 kcal e. -462.4 kcal
(1) Answers
ΔΗ= -115.6 kJ/mol H2 has a Mr of 2, so as mol=mass/mr we can work out that there are 4 moles of H reacting Therefore we multiply -115.6 by 4 = -462.4
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