# How many moles of KNO_3 are contained in one liter of 0,2 KNO_3 solution?

Nov 30, 2017

I think there is a $0.2$ molar quantity...

#### Explanation:

By definition, $\text{molarity"="moles of solute"/"volume of solution}$.

Here, we apparently have a $1 \cdot L$ volume of $0.2 \cdot m o l \cdot {L}^{-} 1$ concentration....

And thus to get the molar quantity, we take the product.....

$\text{molarity"xx"volume of solution} = 1 \cdot \cancel{L} \times 0.2 \cdot m o l \cdot \cancel{{L}^{-} 1} = 0.2 \cdot m o l$...

i.e. a mass of $0.2 \cdot m o l \times 101.1 \cdot g \cdot m o {l}^{-} 1 = 20.2 \cdot g$ with respect to potassium nitrate...