Chem 208, Spring 2008 Problem Set 2Due Friday, Feb. 8 at 2:00 PM Name __________________________ Lab TA Name ______________________ Lab Day/Time _____________ Supplementary Problems (Don’t hand in): Ch. 7: 57, 61, 67, 71, 80, 90, 96 1. You are given the following thermochemical data: N2(g) + O2(g) →2NO(g); ΔH0= 180.6 kJ N2(g) + 3H2(g) →2NH3(g); ΔH0= -91.8 kJ 2H2(g) + O2(g) →2H2O(g); ΔH = -483.7 kJ NOTE: The standard enthalpy of vaporization of water is 44.0 kJ/mol. a)Using the above information, calculate ΔH0f[H2O(g)] and ΔH0f[H2O(l)]. b)Under appropriate conditions, gaseous ammonia will burn in gaseous oxygen, forming only gaseous nitric oxide and liquidwater. Write a balanced equation for the reaction and then calculate the standard enthalpy of combustion ΔH0per mole of NH3(g) c)The standard bond dissociation enthalpy of O2is 498.4 kJ/mol, and the reaction N2O(g) + O (g) →2NO(g) is exothermic by 150.8 kJ. Calculate the standard enthalpy of formation of N2O(g) using any information on this page.
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