In an experiment, a student set out to determine the enthalpy change of combustion of ethane. He took the following values for the standard enthalpy changes of combustion of carbon and hydrogen. $\Delta H_c^{\circ}(\text{carbon}) = -394\,\text{kJ mol}^{-1}$ $\Delta H_c^{\circ}(\text{hydrogen}) = -286\,\text{kJ mol}^{-1}$ From his calculations, the enthalpy change of formation of ethane was found to be $-140\,\text{kJ mol}^{-1}$. What experimental value did he obtain for the standard enthalpy change of combustion of ethane?
- A$-2364\,\text{kJ mol}^{-1}$
- B$-1506\,\text{kJ mol}^{-1}$
- C$-1112\,\text{kJ mol}^{-1}$
- D$-540\,\text{kJ mol}^{-1}$