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April 17, 2014

April 17, 2014

Posted by **Leora** on Friday, March 25, 2011 at 11:03am.

2. What is the percent mass of a solution that contains 75 grams of salt dissolved in 150 grams of water? What is the concentration of the same solutionin parts per million?

3. If a solution is 25% NaCl by mass, what is the mass of salt contained in 150 grams of the solution?

4. What mass of solute is needed to prepare 500 grams of a 15% by mass solution?

5. What mass of sugar is present in 2.50 kilograms of solution that is 30% by mass?

6. What is the mass of solute present in 250 grams of a solution that is 12% by mass?

7. The average salinity off sea water is 34.7%. What is this quantity expressed in parts per million?

- Chemistry -
**DrBob222**, Friday, March 25, 2011 at 10:53pm1. What is the percent by mass of a solution that contains 50 grams of solute dissolved in 200 grams of solution? What is the concentration of the same solution in parts per million?

% w/w = (g solute/g soln)*100 = 25% w/w\.

25g/100 = ??ppm.

What must you multiply 100 by to get 1,000,000? That would be 10^4. So multiply 25 by 10^4 and you will have 2.5^10^4/10^6 = 250,000 ppm

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