Answer:
Step-by-step explanation:
To calculate the number of moles of oxygen (O) in 50.0 g of oxandrolone (C19H30O3), we first need to determine the molar mass of oxandrolone and then use stoichiometry to find the number of moles of oxygen.
The molar mass of oxandrolone (C19H30O3) can be calculated by summing up the atomic masses of its constituent elements:
Molar mass of C19H30O3 = (19 × C) + (30 × H) + (3 × O)
= (19 × 12.01 g/mol) + (30 × 1.01 g/mol) + (3 × 16.00 g/mol)
= 228.19 g/mol + 30.30 g/mol + 48.00 g/mol
= 306.49 g/mol
Now, we can use the molar mass and the given mass of oxandrolone to calculate the number of moles of oxygen:
Number of moles of oxandrolone = Mass of oxandrolone / Molar mass of oxandrolone
= 50.0 g / 306.49 g/mol
Next, we need to determine the mole ratio of oxygen to oxandrolone. From the chemical formula C19H30O3, we can see that there are 3 oxygen atoms per molecule of oxandrolone.
Mole ratio of oxygen to oxandrolone = 3 moles of O / 1 mole of oxandrolone
Finally, we can calculate the number of moles of oxygen:
Number of moles of oxygen = Number of moles of oxandrolone × Mole ratio of oxygen to oxandrolone
Please note that I'll perform the calculation using the given mass of oxandrolone (50.0 g):
Number of moles of oxygen = (50.0 g / 306.49 g/mol) × (3 moles of O / 1 mole of oxandrolone)
Calculating this expression will give us the number of moles of oxygen in 50.0 g of oxandrolone.