Calculate the molar mass of each of the following:

$$\begin{array}{llll}{\text { (a) } \mathrm{N}_{2} \mathrm{O}_{4}} & {\text { (b) } \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{OH}} & {\text { (c) } \mathrm{MgSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}} & {\text { (d) } \mathrm{Ca}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}}\end{array}$$

## Discussion

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How many moles of compound are in each

of the following samples:

$$

\begin{array}{l}{\text { a. } 6.60 \mathrm{g}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \text { ( molar mass of }} \\ {\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}=132.17 \mathrm{g} / \mathrm{mol} )} \\ {\text { b. } 4.5 \mathrm{kg} \text { of } \mathrm{Ca}(\mathrm{OH})_{2} \text { (molar mass of }} \\ {\mathrm{Ca}(\mathrm{OH})_{2}=74.10 \mathrm{g} / \mathrm{mol} )}\end{array}

$$