Chapter 3.4, Problem 2CP

How many moles of hydrogen are there in $\text{6}\text{.50 g}$ of ammonia $\left({\text{NH}}_3\right)$ ?

$\begin{array}{l}\text{a)}\hfill \\ \text{0}\text{.382 mol}\hfill \\ \text{b)}\hfill \\ \text{1}\text{.39 mol}\hfill \\ \text{c)}\hfill \\ \text{0}\text{.215 mol}\hfill \\ \text{d)}\hfill \\ \text{1}\text{.14 mol}\hfill \\ \text{e)}\hfill \\ \text{2}\text{.66 mol}\hfill \end{array}$