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5 August, 15:03

If 32.5 grams of CaO are dissolved in 212 grams of water, what is the concentration of the solution in percent by mass?

6.52% CaO

8.67% CaO

13.3% CaO

15.3% CaO

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Answers (1)
  1. 5 August, 16:58
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    Percent by mass of CaO = Mass of solute / moles of solution x 100%

    (32.5g) / (32.5g+212g) x 100%

    = 13.29 and when you round it becomes 13.3% CaO
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