An electrical heater is used to add 18.25 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 3.12°C. When 1.75 g of methanol (CH3OH) is burned in the same calorimeter, the temperature increases by 6.78°C. Calculate the molar heat of combustion for methanol (enter in kJ).
heat capacity of calorimeter (C) = q/DT
= 5.85 kj/c
no of mol of methanol burned = 1.75/32 = 0.055 mol
heat released(q) = c*DT
= 39.663 kj
molar heat of combustion for methanol(DHrxn) = -q/n
= -721.14 kj/mol
Get Answers For Free
Most questions answered within 1 hours.