In which of the substance the mass fraction of oxygen is higher: a) carbon dioxide CO2 b) carbon monoxide CO

Find the molecular weight of carbon dioxide CO2:

Mr (CO2) = Ar (C) + 2Ar (O) = 12 + 16 x 2 = 44

Find the ratio of the mass of oxygen in the molecule (32) to the mass of the entire molecule (44).

W (O) = (32: 44) = 0.72 shares, or expressed as a percentage (0.72 x 100% = 72.72%)

Find the molecular weight of CO (carbon monoxide):

Мr (CO) = Ar (C) + Ar (O) = 12 + 16 = 28

W (O) = (16:28) x 100% = 57.14%

The mass fraction of oxygen is greater in carbon dioxide.