What is the molecular formula of each compound?

(a) Empirical formula $\mathrm{CH}(\mathscr{M}=78.11 \mathrm{g} / \mathrm{mol})$

(b) Empirical formula $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{2}(\mathscr{M}=74.08 \mathrm{g} / \mathrm{mol})$

(c) Empirical formula $\mathrm{HgCl}(\mathscr{M}=472.1 \mathrm{g} / \mathrm{mol})$

(d) Empirical formula $\mathrm{C}_{7} \mathrm{H}_{4} \mathrm{O}_{2}(\mathscr{M}=240.20 \mathrm{g} / \mathrm{mol})$

a) molecular formula= $\mathrm{C}_{6} \mathrm{H}_{6}$

b) molecular formula= $\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{2}$

c) molecular formula= $\mathrm{Hg}_{2} \mathrm{Cl}_{2}$

d) molecular formula $=\mathrm{C}_{14} \mathrm{H}_{8} \mathrm{O}_{4}$

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