Question

The enthalpy of combustion of n-octane, C8H18, is –4.79 × 107 J/kg. What is the enthalpy of combustion expressed in kJ/g?

Answer 1

47,9 kJ/g

Step-by-step explanation:

The enthalpy of combustion is the change in energy due the reaction of combustion of n-octane. If the enthalpy is -4,79x10⁷ J/kg And knowing (1000J = 1kJ) (1000g = 1kg). The enthalpy of combustion expressed in kJ/g is:

`-4,79x10^7J/kg (1kJ)/(1000J) (1kg)/(1000g)` = 47,9kJ/g

I hope it helps!