Calculate the emf of a hydrogen-oxygen fuel cell operating reversibly if the overall reduction in Gibbs energy is \(238 \mathrm{MJ} / \mathrm{kg} \mathrm{H}_{2}\). If the cell operates at \(75 \%\) of the reversible emf due to internal irreversibilities calculate the magnitude and direction of the heat transfer with the surroundings, assuming that the enthalpy of reaction at the same conditions is \(-286 \mathrm{MJ} / \mathrm{kmol} \mathrm{H}_{2}\).

[1.233 V; \(-53,750 \mathrm{~kJ} / \mathrm{kg} \mathrm{H}_{2}\) ]