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麻煩一下 熱的問題
20. When 0.7521 g of benzoic acid was burned in a calorimeter containing 1,000. g of water, a temperature rise of 3.60°C was observed. What is the heat capacity of the bomb calorimeter, excluding the water? The heat of combustion of benzoic acid is –26.42 kJ/g.A) 1.34 kJ/°C D) 15.87 kJ/°C
B) 4.18 kJ/°C E) 752.1 kJ/°C
C) 5.52 kJ/°C
39. Butane (C4H10) undergoes combustion in excess oxygen to generate gaseous carbon dioxide and water. Given H°f = –124.7 kJ/mol, H°f = –393.5 kJ/mol, H°f = –241.8 kJ/mol, how much energy is released (kJ) when 8.30 g of butane is burned?
A) 22,100 kJ B) 2,658.3 kJ C) 379 kJ D) 759 kJ E) 2,910 kJ
75. A gas is compressed in a cylinder from a volume of 20.0 L to 2.0 L by a constant pressure of 10.0 atm. Calculate the amount of work done on the system.
A) –1.81 × 104 J B) –180 J C) 180 J D) 1.01 × 104 J E) 1.81 × 104 J
81. At 25°C, the following heats of reaction are known:
2ClF(g) + O2(g) Cl2O(g) + F2O(g) H°rxn = 167.4 kJ/mol
2ClF3(g)+2O2(g) Cl2O(g)+3F2O(g) H°rxn = 341.4 kJ/mol
2F2(g) + O2(g) 2F2O(g) H°rxn = –43.4 kJ/mol
At the same temperature, use the above data to calculate the heat released (kJ) when 3.40 moles of ClF(g) reacts with excess F2:
ClF(g) + F2(g) ClF3(g)
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