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24 May, 23:53

A 35.6 g sample of ethanol (c2h5oh) is burned in a bomb calorimeter, according to the following reaction. if the temperature rose from 35.0 to 76.0°c and the heat capacity of the calorimeter is 23.3 kj/°c, what is the value of Î'h°rxn? the molar mass of ethanol is 46.07 g/mol.

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  1. 25 May, 00:11
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    Answer is: molar heat of reaction of combustion of ethanol is 1237.435 kJ/mol.

    m (C₂H₅OH) = 35.6 g.

    n (C₂H₅OH) = m (C₂H₅OH) : M (C₂H₅OH).

    n (C₂H₅OH) = 35.6 g : 46.07 g/mol.

    n (C₂H₅OH) = 0.772 mol.

    ΔT = 76.0°C - 35.0°C = 41°C.

    Q = ΔT · C.

    Q = 41°C · 23.3 kJ/°C.

    Q = 955.3 kJ.

    ΔH = Q / n (C₂H₅OH).

    ΔH = 955.3 kJ / 0.772 mol.

    ΔH = 1237.435 kJ/mol.
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