An experiment was carried out to find the enthalpy of combustion of ethanol. The recorded data are: mass of water $= W\,\text{g}$; mass of ethanol burned $= X\,\text{g}$; temperature rise $= Y^{\circ}\text{C}$; molar mass of ethanol $= Z\,\text{g mol}^{-1}$; specific heat capacity of water $= 4.2\,\text{J K}^{-1}\text{g}^{-1}$. Which expression may be used to work out the enthalpy of combustion of ethanol in $\text{kJ mol}^{-1}$?
- A$\frac{-4.2WYZ}{1000X}$
- B$\frac{-4.2WYX}{1000Z}$
- C$\frac{-4.2XYZ}{1000W}$
- D$\frac{-4.2X(Y+273)Z}{1000W}$