FWS asked in Science & MathematicsChemistry · 2 months ago

Calculate the heat of reaction for the burning process?

When 2.84 g of ethanol C2H5OH is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25 °C to 33.73 °C. The heat capacity of the calorimeter is measured to be 9.63 kJ/ °C. 

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  • 2 months ago

    Heat gained by calorimeter:

    q = C (T2-T1)

    q = 9.63 kJ/°C (33.73 - 25.00) = 84.07 kJ

    So, the combustion released -84.07 kJ

    Moles ethanol = 2.84 g / 46.07 g/mol = 0.0616 mol ethanol

    Heat of combustion of ethanol = -84.07 kJ / 0.0616 mol = -1.36X10^3 kJ/mol

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