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A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. Which numerical setup can be us

January 2019 NY Regents Chemistry Exam


37 A solution contains 25 grams of KNO3 dissolved in 200. grams of H2O. Which numerical setup can be used to calculate the percent by mass of KNO3 in this solution?










Solution: Table T on the reference table gives the formula for percent by mass calculation.

(Mass of part/ Mass of whole)*100

To calculate mass of whole we need to add 25 g with 200g and get 225 g

We get (25g/225g)*100

Answer: 3


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