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Chapter 50 Chapter Basic Calculations Q&A (FPGEE) (1 OF 7) Sample Questions

1. Syrup is an 85% w/v solution of sucrose in water. It has a density of 1.313 g/mL. How many milliliters of water should be used to make 125 mL of syrup?
  1. A. 106 mL
  2. B. 164 mL
  3. C. 57 mL
  4. D. 125 mL
  5. E. 1.33 mL
Answer
Ans: C
Tips: Density of solution = Mass / Volume

1.33 g/ml = weight of solution / 125 ml

125 ml x 1.313 g/ml = 164 g

Therefore, the weight of the solution will be 164 g
Now, we have 85 grams of sucrose in 100 mL of solution
Therefore for 125 mL of solution we need: (125 × 85)/100=106 g
The weight of water in this solution = 164 – 106 = 57g or 57 mL
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