Science
CAlculate the mass of the sample in grams

Question Description

A sample of ethanol (C2H5OH) was burned completely in a bomb calorimeter whose total heat capacity is 30.75 kJ/oC. The temperature of the calorimeter plus the contents increased from 25.6oC to 33.1oC.


Knowing that ethanol's heat of combustion is -1920 kJ/mol, calculate the mass of the sample (in g).

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Final Answer

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30.75 kJ/deg x (33.1 - 25.6) = 230.625 kJ 
230.625 kJ x 1 mol/1920 kJ = 0.120 moles 
0.120 moles x 46 g/mol = 5.52 grams 
There is no sign for the mass of the sample. The sign for the heat of combustion would be negative (exothermic)

Please let me know if you nea case for torture by michale levined any clarification. I'm always happy to answer your questions.

duingpung (540)
Carnegie Mellon University

Anonymous
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