the enthalpy of combustion of benzene is -3301Kj/mol a calorimeter has a heat capacity of 80j/c....
the enthalpy of combustion of benzene is -3301Kj/mol a calorimeter has a heat capacity of 80j/c. how much benzene do you have to burn to heat the calorimeter up to 30c
Homework Answers
Heat required by calorimeter,
Q = Ccal * delta T
= 80 J/oC * 30 oC
= 2400 J
= 2.400 KJ
mol of benzene required = -Q / heat of combustion
= - 2.400 KJ / -3301 KJ/mol
= 7.27*10^-4 mol
Molar mass of C6H6,
MM = 6*MM(C) + 6*MM(H)
= 6*12.01 + 6*1.008
= 78.108 g/mol
use:
mass of C6H6,
m = number of mol * molar mass
= 7.27*10^-4 mol * 78.108 g/mol
= 5.678*10^-2 g
Answer: 5.68*10^-2 g
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