Question

Calculate the grams in solute: 300 g of water in the preparation of 15.0% NaNO solution. Atomic Weight: Na=23,N=14,o=16.

Answer 1

For 15.0% you want 15 g solute/100 g soln where 100 g soln = 15g solute+85 g H2O. For 300 g H2O you want:
let x = grams solute
(x/x+300) = 0.15 and solve for x.

Answer 2

where did you get the 85g H2O?

Answer 3

If the solution is 15.0%, it is 15.0 g solute/100 g SOLUTION. If we have 15.0 g solute, there must be 85 g H2O in order for the total solution to have a mass of 100 grams.