Step 1 of 6 Write the balanced chemical equation for each chemical reaction. Recall that heats of formation refer to reactions producing the given substance from its constituent elements in their natural state. (Use the lowest possible coefficients. In order to maintain the correct stoichiometry, this may include fractional coefficients. Include states-of-matter under the given conditions in your answer.) (a) benzaldehyde, C6H5CHO(I) (b) ethanol, C2H5OH(g) : (c) benzene, C6H6(I); (d) 1-propanol, C3H7OH(I)