Nicotine is a poisonous, addictive compound found in tobacco. A sample of nicotine contains 6.16 mmol of $\mathrm{C},$ 8.56 $\mathrm{mmol}$ of $\mathrm{H},$ and 1.23 $\mathrm{mmol}$ of $\mathrm{N}[1 \mathrm{mmol}(1 \text { millimole })=$ $10^{-3} \mathrm{moll} .$ What is the empirical formula of nicotine?

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What is the molecular formula of each of the following compounds?

$$

\begin{array}{l}{\text { (a) empirical formula } \mathrm{CH}_{2}, \text { molar mass }=84.0 \mathrm{g} / \mathrm{mol}} \\ {\text { (b) empirical formula } \mathrm{NH}_{2} \mathrm{Cl} \text { , molar mass }=51.5 \mathrm{g} / \mathrm{mol}}\end{array}

$$

What is the molecular formula of each of the following compounds?

$$

\begin{array}{l}{\text { (a) empirical formula } \mathrm{HCO}_{2} \text { , molar mass }=90.0 \mathrm{g} / \mathrm{mol}} \\ {\text { (b) empirical formula } \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}, \text { molar mass }=88.0 \mathrm{g} / \mathrm{mol}}\end{array}

$$

Benzene has the empirical formula CH and

an experimental molar mass of 78 $\mathrm{g} / \mathrm{mol} .$

What is its molecular formula?

Oleic acid has the empirical formula

$\mathrm{C}_{9} \mathrm{H}_{17} \mathrm{O} .$ If the experimental molar mass is

$282 \mathrm{g} / \mathrm{mol},$ what is the molecular formula of

oleic acid?

How many formula units are there in

302.48 g of zinc chloride, $\mathrm{ZnCl}_{2} ?$ The molar

mass of zinc chloride is 136.29 $\mathrm{g} / \mathrm{mol} .$