Use Bond energies to estimate the heats of formation of the following gases:

Compound Hf (kJ/mol)
NF3 =
H2N-NH2 =
F2C=CH2* =
CH3Cl* =

*Hint: The standard state of carbon is solid graphite, but bond energies are for reactions in which all reactants and products are in the gas phase. You must use the heat of formation of carbon gas and bond energies to determine this energy.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

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