Also, the atomic weight of hydrogen is 1 gram and oxygen is 16 grams. Water has 3 atoms, two hydrogen atoms, and one oxygen atom. It is calculated as the mass of substance relative to the 1/12 th of the mass of the carbon-12 atom. It is calculated by dividing the mass of a substance by the amount of the substance It is the mass of a mole of a particular substance Difference Between Molar Mass and Molecular Weight Basis With the help of the above example, we can say that both molar mass and molecular mass are the same in their values but are different in their units. Therefore the molecular weight of H 2O = (1x 99 amu) + (1 x 35.45 amu).The number of chlorine atoms present = 1.In other words, we can say that the Molecular weight of a particular molecule is equal to the sum of the atomic masses of each element. With the help of the above equation, we can find the molecular weight of an element or a compound. Therefore, the unit of the molecular weight taken as atomic mass units or amu. The molecular weight has no units because the division has done between two masses that have the same units. Molar mass is the mass of a mole of a particular substance means the mass of a particular compound divided by the amount of substance. While the definition and units are different for molar mass and molecular weight, the value is the same. Whereas molecular weight is the mass of a molecule of a particular substance. Moreover, the main difference between both is that molar mass gives the mass of a mole of a particular substance. Besides, the molar mass and molecular weight are two physical properties of substances.Īlmost all chemical reactions are involved the changes occur in molecules or compounds so it is very important to understand the chemical and physical properties of molecules in order to perform chemical reactions and assume the final products. These molecules attached to each other to form compounds. Molecules are substances formed due to combinations of the same or different atoms in different ratios. Difference Between Molar Mass & Molecular Weight
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