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How many grams of potassium nitrate and water must be used to prepare 175g of a 22.5% solution It would be nice if you could show me how you did it as well.

Hello there, just recently I turned sixteen and I have been thinking about getting a job for a while. After vacillating between Radio Shack and Best Buy, I of course chose Best Buy. (: I want to work as a electronic sales person, and yes I do know how to handle a computer, probably more then the...