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A sample of octane (C8H18) that has a mass of 0. 750 g is burned in a bomb calorimeter. As a result, the temperature of the calorimeter increases from 21. 0°C to 41. 0°C. The specific heat of the calorimeter is 1. 50 J/(g • °C), and its mass is 1. 00 kg. How much heat is released during the combustion of this sample? Use q equals m C subscript p Delta T. 22. 5 kJ 30. 0 kJ 31. 5 kJ 61. 5 kJ.

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Explanation:

The amount of heat for combustion of the sample is equal to the heat that is released in the bomb calorimeter. The equation that may be used in this item is through,

                                      H = mcpdT

where H is heat, m is mass, cp is specific heat, and dT is the difference in temperature.

                                 H = (1000g)(1.50 J/g°C)(41°C - 21°C)

                                      H = 30,000 J = 30 kJ

Thus, the answer is the second choice. 

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