unit-4-review-handout

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

Ask a homework question - tutors are online