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# unit-4-review-answers - Review Energy Changes Rates of...

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Review: Energy Changes, Rates of Reaction and Nuclear Energy

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Questions 1 - 3 1. a) exothermic b) endothermic c) exothermic d) exothermic e) exothermic (in the forward direction) 1. q = cm T = 4.1796 J/g ° C x 500 g x 0.4 ° C = 835.92 J = 0.8 3592 kJ # mol = 10 g x (1 mol / 16 g) = 0.62 5 kJ/mol = 0.8 3592 kJ/0.62 5 mol= 1 .3 kJ/mol 1. 2 Na(s) + C(s) + 1.5 O 2 (g) Na 2 CO 3 (s) H ° f = -1131 kJ/mol
Questions 4 - 5 1. 2N 2 + 6O 2 + 2H 2 4HNO 3 -696.4 4HNO 3 2N 2 O 5 + 2H 2 O 153.2 2H 2 O 2H 2 + O 2 571.6 2N 2 + 5O 2 2N 2 O 5 28.4 kJ 1. ΔH˚ = [ΔH˚ of Na 2 CO 3 + ΔH˚ f of H 2 O + ΔH˚ f of CO 2 ] – [ΔH˚ f of NaHCO 3 ] = [1 mol (-1131kJ/mol) + 1 mol (-241.8 kJ/mol) + 1 mol (-393.5 kJ/mol)] – [ 2 mol (-947.7kJ/mol] = (-1766 .3 kJ) – (-1895.4 kJ) = 129 .1 kJ

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Question 6 - 7 1. N 2 O + 1.5 O 2 H = 81.57 kJ H = 71.9 kJ N 2 O 4 H = 9.67 kJ N 2 + 2O 2 1. N 2 O 4 (g) H = 9.67 kJ N 2 (g) + 2O 2 (g)
Question 8 - 9 1. M-B and Ek are the same (fraction or percent of molecules versus kinetic energy). Ep is potential energy versus path of reaction (similar to time over which the reaction occurs) Ea Fraction of molecules Kinetic energy → 9.

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Reaction Progress
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