Determine the formula weights of each of the following compounds: (a) nitrous
oxide, \(\mathrm{N}_{2} \mathrm{O},\) known as laughing gas and used as an
anesthetic in dentistry; (b) benzoic acid, \(\mathrm{HC}_{7} \mathrm{H}_{5}
\mathrm{O}_{2}\), a substance used as a food preservative; (c)
\(\mathrm{Mg}(\mathrm{OH})_{2}\), the active ingredient in milk of magnesia;
(d) urea, \(\left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO}, \mathrm{a}\)
compound used as a nitrogen fertilizer; (e) isopentyl acetate,
\(\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{C}_{5} \mathrm{H}_{11}\), responsible
for the odor of bananas.