Question

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

Answer 1

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

Explanation:

By definition, `"molarity"="moles of solute"/"volume of solution"`.

Here, we apparently have a `1*L` volume of `0.2*mol*L^-1` concentration....

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

`"molarity"xx"volume of solution"=1*cancelLxx0.2*mol*cancel(L^-1)=0.2*mol`...

i.e. a mass of `0.2*molxx101.1*g*mol^-1=20.2*g` with respect to potassium nitrate...