We have to determine the molar mass of CH₂O₂. And we know the molar mass of each element present in our molecule.
C = 12.01 g/mol H = 1.008 g/mol O = 16.00 g/mol
One molecule of CH₂O₂ has 1 atom of C, 2 atoms of H and 2 atoms of O. To find the molar mass of our compound we have to multiply the molar mass of each element by the number of atoms of each element that the compound has, and then add them.
molar mass of CH₂O₂ = 1 * molar mass of C + 2 * molar mass of H + 2 * molar mass of O
molar mass of CH₂O₂ = 1 * 12.01 g/mol + 2 * 1.008 g/mol + 2 * 16.00 g/mol
molar mass of CH₂O₂ = 46.026 g/mol
Answer: the molar mass of CH₂O₂ is 46.026 g/mol.