Determine the standard heats of the following reactions in kJ/mol, letting the stoichiometric coefficient of the first reactant in each reaction equal one.

a. Nitrogen + oxygen to form nitric oxide (NO).

b. Gaseous n-pentane + oxygen react to form carbon monoxide + liquid water

c. Liquid n-hexane + oxygen react to form carbon dioxide + water vapor. After doing the calculation, write the stoichiometric equations for the formation of the reactant and product species, then use Hess's law to derive the formula you used to calculate ∆Ĥr°.

d. Liquid sodium sulfate + carbon monoxide react to form liquid sodium sulfide + carbon dioxide. (Table B.1 only lists the heats of formation of the solid sodium salts. To estimate the required heat of reaction, use tabulated heats of fusion, which you should assume to be temperature-independent.)