The heat of combustion of octane, C_8H_18, can be measured in a way similar to t
ID: 1056843 • Letter: T
Question
The heat of combustion of octane, C_8H_18, can be measured in a way similar to the method you used to measure the heat of neutralization. The bomb calorimeter is used instead of a coffee cup. The reaction is 2 C_8H_18 (1) + 25 O_2 (g) rightarrow 16 CO_2 (g) + 18 H_2O When 1.02 g of octane was burned in a bomb calorimeter, the temperature of 1.00 kg of water was raised from 22.0 degree C to 35.3 degree C. The specific heat of water is 4.184 J/(g degree C). How many moles of octane were burned? What is the heat of combustion (H) of octane in kilojoules per mole?Explanation / Answer
heat released by 1.02 g Octane = mw*Cw*delta T
= 1000 g * 4.184 J/goC * (35.3-22) oC
= 55647.2 J
number of moles of Octane = mass/molar mass
= 1.02 g/ (8*12 + 18*1) g/mol
= 8.95*10^-3 mol
H = -55647.2 / (8.95*10^-3)
= -6.219*10^6 J/mol
= -6219 KJ/mol
Answer: -6219 KJ/mol
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