final_s05 - CHE 132 S06 Practice Final Exam 1. Question 1...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CHE 132 S06 Practice Final Exam 1. Question 1 deleted. 2. Which one of the following statements is not correct? a. The energy change of any system is equal to the heat gained by the system plus the work done on the system. b. Energy is a state function, but heat and work are path functions. c. Enthalpy is a thermodynamic quantity whose change equals the heat flow at constant volume. d. For solids and liquids, volume changes during chemical reactions are very small. e. The enthalpy change for any overall process is equal to the sum of the enthalpy changes for any set of steps that leads from reactants to products. 3. Calculate the change in temperature when 47 g of ammonium nitrate (NH 4 NO 3 ) dissolve in 100 g water. NH 4 + (aq) + NO 3 - (aq) NH 4 NH 3 (s) Δ H = - 21.1 kJ/mol MM((NH 4 NO 3 ) = 80.05 g/mol, MM(H 2 O) = 18.016 g/mol, C water = 75.3 J mol -1 K -1 . a. 30 K b. 0.03 K c. - 134 K d. - 1 K e. - 30 K 4. Which one of the following statements is not correct? a. When water freezes, heat flows from the system into the surroundings. b. When water freezes, the entropy of the water increases. c. When water freezes, Δ S total > 0. d. When water freezes, Δ S water < 0 e. When water freezes, Δ S surroundings > 0 5. Which one of the following reactions proceed with an increase in entropy? a. H 2 O(g) H 2 O(l) b. 8 H 2 S(g) + 4 O 2 (g) 8 H 2 O(l) + S 8 (s) c. 2 NH 3 (g) + 2 O 2 (g) NH 4 NO 3 (s) + H 2 O(l) d. 2 CO(g) + O 2 (g) 2 CO 2 (g) e. NaCl(s) Na + (aq) + Cl - (aq) 6. Determine Δ S reaction for the synthesis of ammonia, N 2 (g) + 3 H 2 (g) 2 NH 3 (g), when P NH3 = 2 atm, P N2 = 4 atm, and P H2 = 1 atm, given that S o N 2 (g) = 191.61 J/K, S o H 2 (g) = 130.68 J/K, S o NH 3 (g) = 192.8 J/K. a. - 206.4 J/K b. - 192.3 J/K c. 0 J/K d. - 198.1 J/K e. - 969.3 J/K
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7. A mixture of cyclopropane gas (C 3 H 6 ) and oxygen (O 2 ) in a 1.00 to 4.00 mole ratio is used as an anesthetic. What mass of cyclopropane gas is present in a 2.00 L flask at 23.5 o C if the total pressure is 1.00 atm? MM(C 3 H 6 ) = 42.078 g/mol. a. 0.69 g b. 3.45 g c. 2.76 g d. 6.83 mg e. 8.73 g 8. Which one of the following statements in not correct? a. The order of a reaction must be determined by experiments. b. An intermediate is a chemical species produced in an early step of a mechanism and consumed in a later step. c. In a termolecular reaction, three chemical species collide simultaneously. d. When the first step of a mechanism is rate-determining, the predicted rate law for the overall reaction is the rate expression for that first step. e.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

final_s05 - CHE 132 S06 Practice Final Exam 1. Question 1...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online