3.3: Calculate the Heat Energy Change from a Measured Temperature Change Using the Expression Q = mc△T

HEAT ENERGY CHANGE:

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Data from calorimetry experiment can be used to calculate the heat energy change of a reaction:

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EQUATION:

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* m = Mass of Water or volume of Water

*If Water is not used, this is replaced by mass or volume of other solutions

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Example:

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Energy from burning 0.5 g of Propane was transferred to 100 cm3 of Water to raise its temperature by 20°C. Calculate the heat energy change (in KJ)

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Mass of Water =     100 cm3 Heat Capacity of Water =     4.2 j / g Temperature Rise     =     20°C Energy Transferred     =     100    x    4.2    x    20    =    8400 J *1000 J = 1 KJ So 8400 J   =  8.4 KJ                                                                                       Energy Transferred = 8.4 KJ