1. Determine the Molar Mass of Propanal
* Carbon (C): 3 atoms * 12.01 g/mol = 36.03 g/mol
* Hydrogen (H): 6 atoms * 1.01 g/mol = 6.06 g/mol
* Oxygen (O): 1 atom * 16.00 g/mol = 16.00 g/mol
Total molar mass of propanal = 36.03 + 6.06 + 16.00 = 58.09 g/mol
2. Calculate the Mass of Oxygen
The mass of oxygen in one mole of propanal is 16.00 g/mol.
3. Calculate the Percent by Mass
(Mass of oxygen / Molar mass of propanal) * 100% = Percent by mass of oxygen
(16.00 g/mol / 58.09 g/mol) * 100% = 27.54%
Therefore, the percent by mass of oxygen in propanal is approximately 27.54%.
