Question Detail
Question
An unknown compound with a molecular weight of 180 g/mol contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. What is its molecular formula?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Empirical formula: C = 40/12 = 3.33, H = 6.7/1 = 6.7, O = 53.3/16 = 3.33 → ratio CH₂O (mass 30). n = 180/30 = 6, so molecular formula = C₆H₁₂O₆.
Hint
Find the empirical formula first, then determine how many times it fits into the molecular weight.