The second step in converting between the mass of a compound and moles of a compound is to

determine the molar mass of the compound. The molar mass tells you how much one mole of that substance weighs in grams and is calculated by adding up the atomic masses of all the atoms present in the compound. For example, in water (H₂O), you would sum the atomic masses of hydrogen (1 g/mol) and oxygen (16 g/mol) to find that the molar mass is 18 g/mol. Next, you use the molar mass to facilitate conversions between mass and moles. If you know the mass of your compound, divide that mass by the molar mass to find the number of moles. Conversely, if you want to find the mass from a specific number of moles, you simply multiply the number of moles by the molar mass. It's like your own little math adventure!