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21 November, 10:06

A 4.98g sample of aniline (C6H5NH2, molar mass is 93.13g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of delta H°comb for aniline

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  1. 21 November, 10:33
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    the value of delta H° for aniline = - 3201. 5 Kj/mol

    calculation

    Step 1: find heat

    Q (heat) = C (specific heat capacity) x ΔT (change in temperature)

    C = 4.25 kj/c°

    ΔT = 69.8-29.5 = 40.3 c°

    Q = 4.25 kj/c x 40.3 c = 171.28 kj

    Step 2: find the moles of aniline

    moles = mass / molar mass

    = 4.98 g / 93.13 g/mol = 0.0535 moles

    Step 3 : find delta H

    171.28 kj / 0.0535=3201.5 kj/mol

    since the reaction is exothermic delta H = - 3201.5 Kj/mol
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