A compound used in making nylon, is 43.8% oxygen. There are four oxygen atoms per molecule. What is the molecular weight of compound?

100 g compound contain 43.8 g oxygen; 1 8 oxygen present with 10043.8g g compound 16 x 4g or 4 mole oxygen present with 10043.8×16×4=146g compound∴ mol. wt. of compound is 146.