The standard enthalpy of formation of glucose is -1273.3kJ/mol, and for carbon dioxide it is -393.5kJ/mol, and for water -285.8 kJ/mol. What is the standard enthalpy of combustion of glucose, C6H12O6?
The reaction equation has the form C6H12O6 + xO2 -> yCO2 + zH2O. Balancing carbons, y=6. Balancing hydrogens, z=6, so by balancing oxygen atoms, x=6. Then we use a Hess's law cycle (to be shown during interview) to find that the enthalpy of combustion is -(-1273.3kJ/mol)+(-6x-393.5kJ/mol+-6x-285.8kJ/mol) = -2802.5kJ/mol.
AC
Related Chemistry A Level answers
All answers ▸If hydrogen was burnt in a chamber full of oxygen, what would be the effect on the chamber pressure and why?
Explain the trend in boiling points between HF, HCl and HBr.
Explain why silicon dioxide has a higher melting point than sulphur trioxide
Draw a dot-cross diagram of Chlorine Triflouride, and discuss the shape exhibited by the molecule