Homework Help: help!!!!!

Posted by Anonymous on Tuesday, September 13, 2011 at 9:03pm.

1. A sample of air was found to contain 21% oxygen by volume. how many ml of oxygen are present in 2.0 L of air?

2. A 25.0g solution containing salt and water is 2.2% salt by mass. what is the mass (in g) of salt in the solution?

please show me how to solve :)

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