Mole ConceptHard
Question
When 10 mL of ethyl alcohol (density = 0.7893 g mL-1) is mixed with 20 mL of water (density 0.9971 g mL-1) at 25oC, the final solution has a density of 0.9571 g mL-1. The percentage change in total volume on mixing is
Options
A.3.1%
B.2.4%
C.1%
D.None of these
Solution
Total weight of alcohol and water
= 10 × 0.7893 + 20 × 0.9971
Volume of mixture =
= 29.08 mL
Change in volume = (20 + 10) - 29.08 = 0.92 mL
% change in volume =
= 3.06% ≈ 3.1%
= 10 × 0.7893 + 20 × 0.9971
Volume of mixture =
= 29.08 mLChange in volume = (20 + 10) - 29.08 = 0.92 mL
% change in volume =
= 3.06% ≈ 3.1%Create a free account to view solution
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