# How many moles of ammonia contain 1.51 * 10^24 NH_3 molecules?

May 23, 2016

$\text{1 mole of stuff}$ specifies $6.022 \times {10}^{23}$ individual items of stuff. So you have approx. 2 moles.

#### Explanation:

You have $1.51 \times {10}^{24}$ individual ammonia molecules.

$\text{Moles of ammonia}$ $=$

$\left(1.51 \times {10}^{24} \cdot {\text{ammonia molecules")/(6.022xx10^23*"ammonia molecles mol}}^{-} 1\right)$

$=$ $\text{approx. 2 moles of ammonia molecules}$, but don't trust my arithmetic!

How many moles of nitrogen, of hydrogen, do you have in the specified quantity?