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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