What is Hess's law?

The enthalpy change in a reaction is independent of the route taken.

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How can one differentiate between the organic compounds propanal (CH3CH2CHO) and propanone (CH3COCH3)?


The equilibrium N2O4 (g) -->--< 2NO2 (g) is set up when N2O4 dissociates. When 0.0370 moles of N2O4 dissociates at 25 degrees in a 0.5dm3 sealed container, 0.0310 moles of N2O4 remains at equilibrium. Calculate the value of Kc for this reaction.


If you could give your best revision tip for exam preparation what would it be?


How do you make a buffer?


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