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  A solution that is 20% ethanol by volume is found to have a density of 0.977 g/mL. Density of ethanol is 0.789 g/mL. Thus, mass per cent of ethanol solution is
  • a)
    7.89%
  • b)
    9.77%
  • c)
    16.15%
  • d)
    18.72%
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A solution that is 20% ethanol by volume is found to have a density of...
(c) 20% ethanol by volume means 100 m l of (ethanol + H20 ) solution has ethanol = 20 mL 100 mL of solution = 100 x 0.977 g solution = 97.7 g solution 20 mL ethanol = 20 x 0.789 g ethanol = 15.78 g 
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Most Upvoted Answer
A solution that is 20% ethanol by volume is found to have a density of...
Given:
- Solution is 20% ethanol by volume
- Density of solution = 0.977 g/mL
- Density of ethanol = 0.789 g/mL

To find: Mass per cent of ethanol solution

Solution:
1. Let's assume that we have 100 mL of the solution.
2. Since the solution is 20% ethanol by volume, we know that there are 20 mL of ethanol in the solution.
3. We can calculate the mass of ethanol using the density of ethanol:

Mass of ethanol = Volume of ethanol × Density of ethanol
= 20 mL × 0.789 g/mL
= 15.78 g

4. We can calculate the mass of the entire solution using its density:

Mass of solution = Volume of solution × Density of solution
= 100 mL × 0.977 g/mL
= 97.7 g

5. Finally, we can calculate the mass per cent of ethanol in the solution:

Mass per cent of ethanol = (Mass of ethanol ÷ Mass of solution) × 100%
= (15.78 g ÷ 97.7 g) × 100%
= 16.15%

Therefore, the correct answer is option C.
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A solution that is 20% ethanol by volume is found to have a density of 0.977 g/mL. Density of ethanol is 0.789 g/mL. Thus, mass per cent of ethanol solution isa)7.89%b)9.77%c)16.15%d)18.72%Correct answer is option 'C'. Can you explain this answer?
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