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).

Student has agreed that all tutoring, explanations, and answers provided by the tutor will be used to help in the learning process and in accordance with Studypool's honor code & terms of service.

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)

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duingpung (540)
Carnegie Mellon University
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