Difference Between Molar mass and Molecular mass

The Key Difference Between Molar mass and Molecular mass is that molar mass is used to refer to the mass of a substance in grams. The molecule is the smallest particle of a substance that can be a part of a compound. Molar mass is numerically equal to molecular mass. A molar is a unit of measurement in chemistry.
It is used to measure the amount of substance in a sample. Molar mass is expressed in g/mol or kg/mol.

What Is Molar Mass?

Molar mass

Molar mass is defined as the mass in grams of a given substance per mole of that substance.
Molar mass is used to express the mass of substances in terms of grams per mole, giving the ratio of the two units and the two numbers of things being compared.

This is important in chemistry and other science fields when the quantities being dealt with are very large or very small.

The molecular weight can also be called the molecular weight. That is the mass of a substance for a particular quantity. G mol-1 is the SI unit of molar mass.

This will give you the number of atoms/molecules/compounds present in a mole of a substance. In other words, mass is the number of atoms/molecules or compounds in Avogadro.

In a real setting, it is important to weigh atoms and molecules. However, it is difficult to weigh as individual particles because it has a very small mass compared to normal weighing parameters (such as grams and kilograms).

Therefore, the concept of molar mass is useful for filling this gap and measuring particles at a macroscopic level.

What is Molecular mass?

Molecular mass is the mass of molecules and is determined by the masses of all the atoms that make the molecule and the relative proportions of the atoms.
A molecular mass of a substance means the mass of one molecule of that substance. It is not the mass of the substance as a whole.

The molecular weight of a compound is the mass of the molecule. This can be measured using the unit of atomic mass (amu). One-twelfth of the mass of isotope C-12 is one unit of atomic mass.

Dividing the mass of the molecule by the mass of one-twelfth of the mass of isotope C-12 gives the relative mass.

In addition, the molecular weight depends on the isotopes contained in the molecule. When calculating the molecular weight, it is necessary to consider the associated isotope mass.


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MajorĀ  Differences Between Molar Mass and Molecular Mass

  1. These two concepts are different from each other. Molecular weight refers to the molar mass of a substance, and molecular weight represents the molecular weight of a substance.
  2. Molecular weight is defined as the mass of the Avogadro’s number of a substance. Molecular weight, on the other hand, is defined as the sum of the atomic weights of the atoms present in the molecule of a substance, according to the composition of the chemical formula.
  3. In terms of accuracy, molecular weight is less accurate than molecular weight, and the molecular weight is accurate even at high levels of calculation.
  4. G / mol is the SI base of molecular weight and amu is the SI unit of molecular weight.
  5. The molecular weight is obtained by dividing the total mass of moles by the number of moles of the compound. The molecular weight can be calculated by summing the total atomic weights of the individual atoms based on the composition of the compound formula.
  6. Molecular weight can be used to measure compounds, molecules, or atoms. Molecular weight can be used to determine the mass of a molecule.

Examples of Molar mass and Molecular mass

To illustrate the difference between molecular weight and molecular weight, let’s take two examples.

First, let’s calculate the molecular weight of water. It is known that the atomic weight of hydrogen is about 0.007amu and the atomic weight of oxygen is about 0.0094amu. Therefore, the molar mass of water is:

(0.007 amu x (12 grams / mol)) + (0.0094 amu x (12 grams / mol)) = 0.018 grams / mol

Now let’s calculate the molecular weight of water. The water formula is known to be H2O. This means that each molecule of water contains two hydrogen atoms and one oxygen atom. Therefore, the molecular weight of water is as follows.

(0.007 amu x (12 grams / mol)) + (0.0094 amu x (12 grams / mol)) = 0.0308 grams / mol


To understand the difference between molecular weight and molecular weight, it is important to first understand the meaning of each term. Molecular weight is a measure of the average atomic weight of a molecule and is the total molecular weight of all atoms in the molecule.

Understanding these concepts will allow you to more accurately calculate the weight and concentration of molecules in solution.

Molecular weight and molecular weight are important materials in the world of chemistry. The molecular weight of one molecule of a substance is called the molecular weight, and the mass of that molecule is called the molecular weight. Their IR units are also different.

The molecular weight is measured in g / mol, and the molecular weight is measured in amu, which represents the unit of atomic mass.

Both materials are widely used in chemistry and are useful for addressing them and their differences.

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