Question

How many grams of KNO3 should be used to prepare 2.00 liter of a 0.50 m solution

Answer 1

Mr of KNO3 = 101.

n = cv where n is moles, c is concentration (in this case 0.5 moles for every litre) and v is the volume

your moles would be 0.5 x 2 =1

and since n (moles) = m/mr and your mole is 1 .. your mass would be 101g

Hope I answered your question! :)