# Question #258e5

##### 1 Answer
Apr 10, 2014

8.25 grams of ${O}_{2}$ has 0.258 moles of Oxygen.

Here's how you figure that out:

Oxygen is one of the 7 diatomic elements, so it is normally ${O}_{2}$

You find it's molar mass (or mass for one mole of it) by adding up two of the masses from the Periodic Table.

16.00 x 2 = $\frac{32.00 g}{1 m o l {O}_{2}}$

Now, start with the given (8.25 g of ${O}_{2}$)

$\frac{8.25 g {O}_{2}}{1} \cdot \frac{1 m o l {O}_{2}}{32.00 g} = 0.2578$ g, round $\to 3$ sig figs
$= 0.258 g$ ${O}_{2}$