# If you have 68.5 moles of P_4O_10 how many moles of P are there?

Mar 5, 2017

I have 4 decks of cards, then how many cards do I have in the diamond suit.

#### Explanation:

Well clearly, I have $4 \times 13$ cards in the diamond suit.

You propose $68.5 \cdot m o l$ of ${P}_{4} {O}_{10}$, and clearly I have $4 \times 68.5 \cdot m o l$ of $\text{phosphorus atoms}$.

And this has a precise numerical value,

I,e, $4 \times 68.5 \cdot m o l \times 6.022 \times {10}^{23} \cdot m o {l}^{-} 1 = 1.65 \cdot {10}^{26}$ $\text{phosphorus atoms} .$