A chemist analyzes a pure sample of propanal (C3H6O). What is the calculated percentage of oxygen by mass in this specific compound?
Q1. A chemist analyzes a pure sample of propanal (C3H6O). What is the calculated percentage of oxygen by mass in this specific compound?
Answer: 27.6%
Explanation: Propanal (58 g/mol) contains 16g of oxygen; (16/58)*100 equals 27.6%. 16.0% would imply a much larger molar mass.