How do you calculate the Relative Molecular Mass?
The molecular mass of a molecular substance is the mass of the substance’s smallest constituent particle, the molecule. Molecules are groups of two or more atoms connected by attractions called chemical bonds. The periodic table of the chemical elements contains the masses of all known atoms. To calculate the molecular mass of a substance, you add the masses of each atom in one molecule of the substance. You can compare the molecular masses of two substances to calculate the relative molecular mass. Analyze the chemical formulas of the substances for which you want to calculate the relative molecular mass. For example, if you compare oxygen gas (O2) and nitrogen gas (N2), one molecule of oxygen gas contains two atoms of oxygen, and one molecule of nitrogen gas contains two atoms of nitrogen. Calculate the molecular mass of each substance by adding the individual atomic masses in the substances. The mass of the most common isotope of a particular atom is the bottom number in its box on
