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20 April, 12:12

A sample of hexane (C6H14) has a mass of 0.580 g. The sample is burned in a bomb calorimeter that has a mass of 1.900 kg and a specific heat of 3.21 J/giK. What amount of heat is produced during the combustion of hexane if the temperature of the calorimeter increases by 4.542 K?

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  1. 20 April, 13:31
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    We first calculate the heat released:

    Specific heat = 3.21 kJ/kgK

    Heat released = heat absorbed by calorimeter

    Heat absorbed = mcΔT

    = 1.9 x 3.21 x 4.542

    = 27.7 kJ

    Now, we calculate the moles of hexane present:

    Moles = mass / Mr

    moles = 0.58 / (12 x 6 + 14)

    = 0.0067

    Heat of combustion = 27.7 / 0.0067 kJ/mol

    ΔH (combustion) = 4,134.3 kJ / mol
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