The heat of combustion of octane, C,Hp, can be measured in a way similar to the
ID: 555302 • Letter: T
Question
The heat of combustion of octane, C,Hp, 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 2502 (g) 16 CO2 (g) 18H20 (1) + 2C,H,s (1) + When 1,02 g of octane was burned in a bomb calorimeter, che temperature of 1.00 kg ofwater was raised from 22.0 °C to 35.3° C. The specific heat ofwater is 4184J/ (g C). How many moles of octane were burned? What is the heat of combustion ( H) of octane in kilojoules per mole?Explanation / Answer
moles = mass / molar mass
moles of ocatne burned = 1.02 / 114
moles of ocatne burned = 8.95 x 10^-3
mass of water = 1 kg = 1000 g
Q = m Cp dT
Q = 1000 x 4.184 x (35.3 -22)
Q = 55647 J
Q = 55.647 kJ
heat of combustion = -Q / n
= -55.647 / 8.95 x 10^-3
= - 6218 kJ / mol
heat of combustion = - 6218 kJ / mol
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