Chemistry question help? ?
The percentage composition of a compound is found to be 39.9% carbon, 6.70% hydrogen and 53.4% oxygen. What is the empirical formula?
- 4 weeks ago
Convert the percentages to grams out of 100:
Convert these into moles by dividing by molar mass
3.325 moles C (12 g/mole)
6.70 moles H (1 g/mole)
3.3375 moles O (16 g/mole)
So the ratio is 3.325 moles C : 6.70 moles H : 3.3375 moles O.
Because it's empirical formula (simplified ratios), we simplify this down. 6.7 is about 2x the other numbers
1 C : 2 H : 1 O
COH2Source(s): Took organic 1+2 chemistry last year