In the case of a substance with a molecular mass of 1.75 g, how many atoms are in this substance? The answer will depend on the nature of the substance. Some substances have many atoms in them, while others have fewer atoms. The molar mass of a substance is the measurement unit used by scientists. A mole is equal to 6.022×1023 particles. These can be individual atoms or molecules or any other particle. We calculate the moles of a substance by determining its Molar Mass to determine how many atoms are contained in a sample of 1 gram.
The molar mass of a substance tells you how many grams of the compound are in one mole. To calculate the molar mass of a compound, first calculate the atomic mass of each atom in the formula. This gives you the molecular mass of the compound, which in turn is called the formula weight. Next, multiply the total weight of the formula by the atomic masses of all the formula atoms.