Calorimetry

The following may be useful.

   1) Determine the enthalpy change for the combustion of ethane to produce carbon dioxide and water vapor.

2C₂H₆(g) + 7O₂(g) 4CO₂(g) + 6H₂O(g)

(a) -551 kJ

(b) -2856 kJ

(c) -3120 kJ

(d) 551 kJ

(e) 2856 kJ

   2) 1.00 g of stearic acid, (CH₃(CH₂)₁₆CO₂H), was burned in a bomb calorimeter. The bomb had a heat capacity of 652 J/ºC and a 500. g water reservoir. If the temperature rose from 25.0 to 39.3 ºC, how much heat was released when the stearic acid was burned?

(a) 39.2 kJ

(b) 29.9 kJ

(c) 108 kJ

(d) 9.32 kJ

   3) Determine the enthalpy change for the combustion of butane to produce carbon dioxide and water vapor.

2C₄H₁₀(g) + 13O₂(g) 8CO₂(g) + 10H₂O(g)

(a) 3790 kJ

(b) 253 kJ

(c) -253 kJ

(d) -5314 kJ

(e) -4230 kJ

   4) 1.00 g of sucrose (table sugar), C₁₂H₂₂O₁₁, was burned in a bomb calorimeter. The bomb had a heat capacity of 547 J/ºC and a 775 g water reservoir. If the temperature rose from 25.00 to 29.35 ºC, how much heat was released when the sugar was burned?

(a) 111 kJ

(b) 14.1 kJ

(c) 16.5 kJ

(d) 2.38 kJ

   5) Determine the enthalpy change for the combustion of acetylene to produce carbon dioxide and water vapor.

2C₂H₂(g) + 5O₂(g) 4CO₂(g) + 2H₂O(g)

(a) 2511 kJ

(b) 862 kJ

(c) -2511 kJ

(d) -862 kJ

(e) -2599 kJ

   6) 1.00 g of alanine, CH₃CH(NH₃)CO₂H, was burned in a bomb calorimeter. The calorimeter had a heat capacity of 719 J/ºC and a 450. g water reservoir. If the temperature rose from 20.00 to 26.92 ºC, how much heat was released when the alanine was burned?

(a) 4.98 kJ

(b) 18.0 kJ

(c) 70.0 kJ

(d) 13.0 kJ

   7) Determine the enthalpy change for the combustion of ammonia to produce nitrogen monoxide and water vapor.

4NH₃(g) + 5O₂(g) 4NO(g) + 6H₂O(g)

(a) -105 kJ

(b) -1170 kJ

(c) -905 kJ

(d) 105 kJ

(e) 905 kJ

    8) 1.00 g of caffeine, C₈H₁₀O₂N₄, was burned in a bomb calorimeter. The calorimeter had a heat capacity of 563 J/ºC and a 692 g water reservoir. If the temperature rose from 20.00 to 26.32 ºC, how much heat was released when the caffeine was burned?

(a) 91.0 kJ

(b) 3.56 kJ

(c) 18.3 kJ

(d) 21.9 kJ

   9) Determine the enthalpy change for the combustion of dihydrogen sulfide to produce sulfur dioxide and water vapor.

2H₂S(g) + 3O₂(g) 2SO₂(g) + 2H₂O(g)

(a) -1124 kJ

(b) -1036 kJ

(c) -518 kJ

(d) 1036 kJ

(e) 518 kJ

  10) Determine the enthalpy change for the combustion of liquid methanol to produce carbon dioxide and water vapor.

2CH₃OH(l) + 3O₂(g) 2CO₂(g) + 4H₂O(g)

(a) -1277 kJ

(b) -1453 kJ

(c) -397 kJ

(d) 1277 kJ

(e) 397 kJ