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Identify the letter that best completes the statement or answers the question by circling or highlighting the ONE correct letter. (5 marks) 6. A chemical system in which ONLY energy can flow into or out of a system is described as a. a closed system d. a chemical system b. an open system e. none of the above c. an isolated system 7. The decomposition of ammonia into hydrogen and nitrogen gas has a molar enthalpy of reaction of +45.9 kJ/mol of ammonia. Which of the following would be the CORRECT thermochemical equation to represent this reaction. 2NH3(g) N2(g) + 3H2(g) + 45.9 kJ 2NH3(g) + 45.9 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) + 91.8 kJ 2NH3(g) + 91.8 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) ∆HRx = -45.9 kJ/mol NH3 8. Using the enthalpies of formation, what is the enthalpy change for the following reaction? CO2(g) → CO(g) + 1/2 O2(g) a. –283 kJ d. +506 kJ b. +283 kJ e. None of the above c. -506 kJ 9. Using the following thermochemical data: 1. C2H2(g) + 5/2 O2(g) → 2CO2(g) + H2O(l) ΔH = –1.30 × 103 kJ 2. C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(l) ΔH = –1.56 × 103 kJ 3. H2(g) + 1/2 O2(g) → H2O(l) ΔH = –2.86 × 102 kJ What is ∆H for the following reaction? C2H6(g) → C2H2(g) + 2H2(g) a. -2.60 x 101 kJ d. -5.46 x 103 kJ b. -3.12 x 102 kJ e. 2.60 x 101 kJ c. +3.12 x 102 kJ f. none of the above 10. For the following reaction, the rate of consumption of Al(s) is -2.0 mol/L s. The rate of production of Na would be: ? a. 2 mol/Ls d. 18 mol/Ls b. 6 mol/Ls e. not enough information is given c. 9 mol/Ls f. none of the above

Question

Identify the letter that best completes the statement or answers the question by circling or highlighting the ONE correct letter. (5 marks)

  1.  A chemical system in which ONLY energy can flow into or out of a system is described as

a. a closed system d. a chemical system b. an open system e. none of the above c. an isolated system

  1.  The decomposition of ammonia into hydrogen and nitrogen gas has a molar enthalpy of reaction of +45.9 kJ/mol of ammonia.  Which of the following would be the CORRECT thermochemical equation to represent this reaction.

2NH3(g) N2(g) + 3H2(g) + 45.9 kJ 2NH3(g) + 45.9 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) + 91.8 kJ 2NH3(g) + 91.8 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) ∆HRx = -45.9 kJ/mol NH3

  1.  Using the enthalpies of formation, what is the enthalpy change  for the following reaction?

CO2(g) → CO(g) + 1/2 O2(g) a. –283 kJ d. +506 kJ b. +283 kJ e. None of the above c. -506 kJ

  1.  Using the following thermochemical data:
  2. C2H2(g) + 5/2 O2(g) → 2CO2(g) + H2O(l) ΔH = –1.30 × 103 kJ
  3. C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(l) ΔH = –1.56 × 103 kJ
  4. H2(g) + 1/2 O2(g) → H2O(l) ΔH = –2.86 × 102 kJ

What is ∆H for the following reaction? C2H6(g) → C2H2(g) + 2H2(g)

a. -2.60 x 101 kJ d. -5.46 x 103 kJ b. -3.12 x 102 kJ e. 2.60 x 101 kJ c. +3.12 x 102 kJ f. none of the above

  1. For the following reaction, the rate of consumption of Al(s)  is -2.0 mol/L s. The rate of  
            production of Na would be:

? a. 2 mol/Ls d. 18 mol/Ls b. 6 mol/Ls e. not enough information is given c. 9 mol/Ls f. none of the above

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Solution

  1. The correct answer is a. A closed system is one in which only energy can flow into or out of the system.

  2. The correct thermochemical equation is 2NH3(g) → N2(g) + 3H2(g) ∆HRx = +45.9 kJ/mol NH3. The positive sign indicates that the reaction is endothermic, meaning it absorbs heat from its surroundings.

  3. Without knowing the specific enthalpies of formation for CO2(g), CO(g), and O2(g), it's impossible to calculate the enthalpy change for this reaction. Therefore, the correct answer is e. None of the above.

  4. To find the ∆H for the reaction C2H6(g) → C2H2(g) + 2H2(g), you would need to use Hess's Law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for each step in the reaction. Without knowing the steps of the reaction, it's impossible to calculate ∆H. Therefore, the correct answer is f. None of the above.

  5. The rate of production of Na would depend on the stoichiometry of the reaction, which is not given. Therefore, the correct answer is e. Not enough information is given.

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