a 45.8mL sample of a 5.8 M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0g KNO3?

how do you do this?

moles of solution: 5.8*.0458 moles
Grams of solute= moles*molmassKNO3

Volume of 15g= 1000ml*15/gramssoluteabove