A 1.250 g sample of octane(C_(8)H_(18)) is burnedin excess of oxygen in a bomb calorimeter. The temperatre of the calorimeter risesfrom 294.05 K to 300.78K. If heat capacityof the calorimeter is 8.93kJ//K, find the heat transferred to the calorimeter. Also calculate the enthalpy combustion of the sample of octane.

A 1.250 g sample of octane(C_(8)H_(18)) is burnedin excess of oxygen i

1.	A 1.250 g sample of octane(C_(8)H_(18)) is burnedin excess of oxygen in a bomb calorimeter. The temperatre of the calorimeter risesfrom 294.05 K to 300.78K. If heat capacityof the calorimeter is 8.93kJ//K, find the heat transferred to the calorimeter. Also calculate the enthalpy combustion of the sample of octane.
Answer» SOLUTION :Rise in temperature ` = 300.78 - 294.05K = 6.73K ` Heattransferredto the calorimeter `= ` Heat capacity of the calorimeter `xx` Rise in TEMP. Molar mass of `= ( 8.90kJ K^(-1)) ( 6.73K) = 60.1 kJ` `C_(8) H_(18) = 8 xx 12 + 18 = 114 G mol^(-1)` `:. `ENTHALPY of combustion`= ( 60.1)/( 1.250 ) xx 114 kJ mol^(-1)=5481.1kJ mol^(-1)`