Final answer:
To calculate the mass percent of oxygen in dinitrogentetroxide, divide the mass of oxygen by the total mass of the compound and multiply by 100.
Step-by-step explanation:
To calculate the mass percent of oxygen in dinitrogentetroxide (N2O4), you need to divide the mass of oxygen by the total mass of the compound and multiply by 100. The molar mass of N2O4 can be calculated by adding the molar mass of two nitrogen atoms and four oxygen atoms: 28 (2 nitrogen atoms) + 64 (4 oxygen atoms) = 92 g/mol. The molar mass of oxygen is 32 g/mol. The mass percent of oxygen in N2O4 can be calculated as follows:
Mass percent of oxygen = (mass of oxygen / mass of N2O4) * 100
Mass of oxygen = (4 oxygen atoms * 32 g/mol) = 128 g/mol
Mass percent of oxygen = (128 g/mol / 92 g/mol) * 100 = 139.13%