Question

In: Chemistry

A 2.31g sample of butter is placed in a colorimeter with a heat capacity of 210j/℃

A 2.31g sample of butter is placed in a colorimeter with a heat capacity of
210j/℃. Exactly 250g water at 17.05 ℃ are added to the other chamber in the
calorimeter, and the butter combusted. The temperature of the entire
calorimeter apparatus increased to 54.08 ℃
You may assume the butter is pure glyceril tristearate

Solutions

Expert Solution

mass of water = 250 g

                   mass of butter = 2.31 g

                  molar mass of butter = 891.485 g/mol

                  Specific heat = 4.184 J/g.c

Heat released = Heat absorbed by water

                       = mass * specific heat * temperature change of water

                       = 250 * 4.184*( 210-17.05)

                       = 201825 J

Moles of butter = mass / molar mass of butter

                         = 2.31 / 891.485

                         = 0.00259 mol

H = -heat released / moles of butter

        = - 201825 / 0.00259

        = - 7.79 * 10^7 J / mol

H = -7.79 * 10^4 kJ / mol

queen_honey_blossom answered 2 years ago
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