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unit-4-review-handout

unit-4-review-handout - Questions 1 3 Review Energy Changes...

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Review: Energy Changes, Rates of Reaction and Nuclear Energy Questions 1 - 3 1. a) exothermic b) endothermic c) exothermic d) exothermic e) exothermic (in the forward direction) 2. q = cm Δ 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 3. 2 Na(s) + C(s) + 1.5 O 2 (g) Na 2 CO 3 (s) Δ H ° f = -1131 kJ/mol Questions 4 - 5 4. 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 5. Δ H ˚ = [ Δ H ˚ of Na 2 CO 3 + Δ H ˚ f of H 2 O + Δ H ˚ f of CO 2 ] – [ Δ H ˚ 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 Question 6 - 7 7. N 2 O + 1.5 O 2 Δ H = 81.57 kJ Δ H = 71.9 kJ N 2 O 4 Δ H = 9.67 kJ N 2 + 2O 2 6. N 2 O 4 (g) Δ H = 9.67 kJ N 2 (g) + 2O 2 (g) Question 8 - 9 8. 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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