Describe the measurement of `Delta U` by bomb calorimeter.

Calculate the enthalpy of combustion of acetic (1) when burnt in excess of O_(2) in a bomb calorimeter. Given that DeltaH_(f)^(@), H_(2)O_((l))=-285.84" KJ mol"^(-1) and Delta_(f)H^(@), CO_(2(g))=-"393.52 KJ mol"^(-1), Delta_(f)H^(@)CH_(3)COOH_((l))=-"463 Kj mol"^(-1) .

1.250 g of a sample of octane (C_(8)H_(18)) is burnt in excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rises from 298 K to 304.73 K. If heat capacity of calorimeter is 8.93 kJ/K. Calculate the heat transferred. Also calculate Delta U and Delta H of the reaction at 298 K. The reaction involved is C_(8)H_(18(l)) + (25)/(2)O_(2(g)) rarr 8CO_(2(g)) + 9H_(2)O_((l)) .

For complete combustion of ethanol, C_(2)H_(5)OH(l) + 3O_(2)(g) rarr 2CO_(2)(g) + 3H_(2)O(l) the amount of heat produced as measured in bomb calorimeter is 1364.47 kJ mol^(-1) at 25^(@)C . Assuming ideality the enthalpy of comustion, Delta_(c)H for the reaction will be ( R = 8.314 kJ mol^(-1) )

Describe a bomb calorimeter and explain how heat of formation of an organic compound is determined.

Write the expression for Delta U under an isothermal process.

Write the relation between Delta H and Delta U .