unit-4-review-answers

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
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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]
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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)
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1. M-B and Ek are the same (fraction or percent of molecules versus kinetic energy). Ep is potential energy versus path of
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unit-4-review-answers - Review: Energy Changes, Rates of...

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