Mass percentages from molar masses of ester hydrolysis products Steps:

• Ethyl ethanoate (CH₃COOCH₂CH₃) hydrolyses to ethanoic acid (CH₃COOH) and ethanol (CH₃CH₂OH); basic conditions with NaOH typically yield salt, but products are often considered as acid after acidification in such analyses.
• Molar mass of ethanoic acid: 60 g/mol; ethanol: 46 g/mol.
• Total molar mass of organic products: 60 + 46 = 106 g/mol.
• Percentage of ethanol: (46/106) × 100 ≈ 43%; ethanoic acid: (60/106) × 100 ≈ 57%.

Why C is correct:

• 42% and 57% are the closest match to calculated values of ~43% ethanol and ~57% ethanoic acid based on molar mass ratio.

Why the others are wrong:

• A: 32% and 67% deviate too far from 43–57% ratio, possibly confusing salt masses.
• B: 38% and 61% underestimate ethanol percentage.
• D: 50% and 50% ignores unequal molar masses of products.

Final answer: C