Calculate the standard enthalpy change for the reaction representing photosynthesis: Data:

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Calculate the standard enthalpy change

\Delta H^{\circ}

for the reaction representing photosynthesis:

6\text{CO}_2(g)+6\text{H}_2\text{O}(l)\rightarrow \text{C}_6\text{H}_{12}\text{O}_6(s)+6\text{O}_2(g)

Data:

\Delta H_f^{\circ}(\text{CO}_2\text{(g)}) = -393.5\,\text{kJ mol}^{-1}

\Delta H_f^{\circ}(\text{H}_2\text{O}(l)) = -285.8\,\text{kJ mol}^{-1}

\Delta H_f^{\circ}(\text{C}_6\text{H}_{12}\text{O}_6(s)) = -1273\,\text{kJ mol}^{-1}

(a)

+1.3\times10^{3}\,\text{kJ}

(b)

-2.8\times10^{3}\,\text{kJ}

(c)

+2.8\times10^{3}\,\text{kJ}

(d)

-5.9\times10^{2}\,\text{kJ}