Question
A 2.50 mol sample of benzene (C6H6, 78.11 g/mol) was burned in a bomb calorimeter with...
A 2.50 mol sample of benzene (C6H6, 78.11 g/mol) was burned in a bomb calorimeter with a heat capacity of 800 J/°C. The calorimeter contained 100g of water (4.18J/g°C) and the temperature increased by 4°C. What is the molar enthalpy of combustion for this compound?
Homework Answers
Answer #1
heat absorbed by calorimeter = heat capacity * temperature change
= 800*4 = 32000joules
heat absorbed by water = mc
T
= 100*4.18*4 = 1672 joules
total heat = 32000+1672 = 33672 joules = 33.672 kj
total heat divide by 2.5 moles of benzen = 33.672/2.5 = 13.4688kj/mole
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