Question on: SS1 Chemistry - Solutions and Concentration
A solution contains 30 grams of ethanol (C2H5OH) in 70 grams of water. What is the mass percentage of ethanol in the solution?
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Step 1: Calculate the total mass of the solution.
Total mass of the solution = Mass of ethanol + Mass of water
= 30 g + 70 g = 100 g
Step 2: Calculate the mass percentage using the formula:
Mass percentage = (Mass of solute / Total mass of solution) x 100
= (30 g / 100 g) x 100
= 30%
The mass percentage of ethanol in the solution is 30%.
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