Determine the formula weights of each of the following compounds:
(a) Nitrous oxide, N2O, known as laughing gas and used as an anesthetic in dentistry
(b) Benzoic acid, HC7H5O2, a substance used as a food preservative
(c) Mg(OH)2, the active ingredient in milk of magnesia
(d) Urea, (NH2)2CO, a compound used as a nitrogen fertilizer
(e) Isopentyl acetate, CH3CO2C5H11, responsible for the odor of bananas.