Evaluate how energy change during the reaction between sugar and concentrated sulphuric acid can be measured and standardised.

Present given reaction has two half-equations.

${\mathrm{Cu}}^{2+}\left(\mathrm{aq}\right)+\mathrm{Zn}\left(\mathrm{s}\right)\to \mathrm{Cu}\left(\mathrm{s}\right)+{\mathrm{Zn}}^{2+}\left(\mathrm{aq}\right)$

Evaluate the feasibility of the Daniel cell for contributing to global energy requirements.

Calculate, using the information in the table, the enthalpy of combustion of ethanol.

Calculate, using the information in the table, the enthalpy of combustion of octane $\left({\mathrm{C}}_8{\mathrm{H}}_{18}\right)$, a major component of petrol.