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Conetration/Percent by mass

Posted: Thu Mar 09, 2017 10:32 am
by George
A solution is mad containing 22.8g of magnesium nitrate per 325g of water.
What is the weight/weight % or percent by mass of the solute?

I have tried twice to answer this and I don't seem to be getting it right. I know that for weight weight % you divide the two weights and then multiply by 100 to get the percent, but it's still incorrect.