3/17/2023 0 Comments Oxygen molar mass![]() ![]() Remember that one amu is equivalent to 1 gram/mole. The molecular mass of water is 18.015 amu. Molecular mass of H 2O = 2.016 amu + 15.999 amu ![]() The molecular mass of water will be 2 masses of hydrogen plus the mass of oxygen. The periodic table shows the atomic mass of hydrogen is 1.0008 amu and the atomic mass of oxygen is 15.999 amu. This means one water molecule contains two hydrogen atoms and one oxygen atom. If there is no subscript following an element symbol, it means there is one atom of that element in the formula.įor example, water has the molecular formula H 2O. The number of atoms of each element is its subscript in the molecular formula. Once you know the atomic makeup of the molecule, you use the periodic table to find the mass of each atom and add them together. Add up the atomic masses of each element.Ĭalculating molecular mass requires that you know the number and type of atoms that make up the molecule. ![]() Multiply each atomic mass by its subscript in the formula.Look up the atomic masses of each element in the formula.Write the molecular formula for the molecule or compound.Here is how to find molecular mass, example calculations, and a look at the difference between molecular mass and molar mass. Usually, you report molecular mass (m) in units of daltons (Da) or atomic mass units (amu or u). Molecular mass is the mass of one molecule. Molecular mass is the mass of a molecule or compound according to its molecular formula. This entry was posted on Augby Todd Helmenstine (updated on August 17, 2022) ![]()
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