The first 5.42 degrees C is due to the calorimeter. Total heat for 7.49 C is
20.50 kJ x (7.49/5.42) = 28.329 kJ for combustion CH3OH in that calorimeter.
The difference is about 7.8 kJ but you can do that more accurately. Then 7.8 kJ x (32/1.25) = ? kJ/mol
Check my work.
An electrical heater is used to add 20.50 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 5.42°C. When 1.25 g of methanol (CH3OH) is burned in the same calorimeter, the temperature increases by 7.49°C. Calculate the molar heat of combustion for methanol (enter in kJ).
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