Difference Between Molecular Mass and Molar Mass

By: | Updated: Jul-21, 2021

A molecule is defined as the smallest unit of a chemical compound that can be formed by combining two or more atoms. The molecule has a unique shape, which is determined by the number of atoms in it. Molecules are usually formed from elements, which are different from each other, but they still have the same chemical properties. There are many different kinds of molecules, but they all have one thing in common: They have a specific shape and structure.

If you were to count the number of atoms in a molecule, you would get a value called the molecular weight. The molecular weight is an important concept in chemistry because it gives us information about how many molecules are in a sample. The molecular weight is equal to the sum of the atomic weights of all the atoms in a molecule.

Summary Table

Molecular Mass Molar Mass
Molecular mass is the mass of a single molecule Molar mass is the mass of a molecule as a whole.
Molecular mass is measured in grams (g) Molar mass is measured in grams per mole (g/mol)
Molecular mass is used in chemistry, biochemistry, biophysics, etc. Molar mass is used in physical chemistry, general chemistry, and physical science.

Definitions:

Difference Between Molecular Mass and Molar Mass

In addition to the number of atoms, molecules also have a mass, which is also referred to as the molar mass. The molar mass is equal to the mass of a single molecule divided by the molecular weight. The number of molecules in a sample does not determine its molar mass. It is the molecular weight that determines this value.

Science is a very complex subject, and there are many different methods used to determine the mass of a molecule. The molar mass is the most common method used to determine the mass of a molecule. However, this method is not always accurate.

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If you want to learn more about how molecular mass is determined, you need to know the difference between molecular mass and molar mass. So, in this article, we will discuss the difference between molecular mass and molar mass. We will also explain how molecular mass is determined, how it is used, and why it is not always accurate.

You will also learn about some other terms that are used to describe the mass of a molecule. In addition, you will learn about the units used to measure the mass of a molecule.

Maybe you have asked yourself, “How do I calculate the molecular mass of a molecule?” “How do I calculate the molar mass of a molecule?” and “How can I find the molecular mass of a molecule?”

These are common questions that are asked by students, scientists, and researchers. So, let’s start our discussion with how to calculate the molecular mass of a molecule.

What is molecular mass?

Molecular mass is the number of grams in a molecule. For example, 1 gram of hydrogen has a molecular mass of 1 gram. This is the number of grams in one molecule. The molecular mass of an element can be calculated by using the formula:

Molecular mass = atomic mass + atomic number + extra mass

Molecular mass is a fundamental unit of weight and is used to express the relative weight of molecules. It is usually measured in kilogram units, but can also be measured in amu (atomic mass units). It’s used to measure compounds and determine their molecular weights. In general, if you have two different compounds with the same atomic number and atomic mass, then they will have the same molecular weight.

What is molar mass?

The molar mass of a substance is the sum of the masses of all the atoms or molecules present in it. The units used to express molar mass are kg/mol. The number of grams of a given substance per mole is called molar mass. Molar mass is used to calculate the amount of a substance that can be present in a solution.

What are the similarities between molecular mass and molar mass?

Before we look at the differences between molecular mass and molar mass, it is important to understand what the similarities are. The following are some of the similarities between molecular mass and molar mass.

  1. Molecular mass and molar mass are two different names for the same quantity.
  2. Molecular mass and molar mass are used to describe the masses of compounds that have molecular weights.
  3. Molecular mass and molar mass are used to describe the masses of compounds that have molar masses.
  4. The terms molecular weight and molar weight are sometimes used interchangeably when referring to molecular mass or molar mass.

What are the differences between molecular mass and molar mass?

Now that you know what molar mass and molecular mass are, let’s learn about the differences between molecular mass and molar mass.

  1. The meaning:

Molecular mass is the mass of a single molecule. This means that molecular mass is the mass of one atom or one molecule.

Molar mass is the mass of a molecule as a whole. The molecular mass is the sum of the masses of all the atoms in a molecule.

  1. Units:

Molecular mass is measured in grams (g). A gram is defined as one-thousandth of a kilogram (kg). One gram = 1 g = 1000 g = 0.001 kg.

Molar mass is measured in grams per mole (g/mol). A gram per mole is defined as one-thousandth of a kilogram per mole (kg/mol). One gram per mole = 1 g/mol = 1000 g/mol = 0.001 kg/mol.

  1. Usage:

Molecular mass is used in chemistry, biochemistry, biophysics, etc.

Molar mass is used in physical chemistry, general chemistry, and physical science.

  1. Calculations:

Molecular mass is calculated by multiplying the atomic mass of each atom in a molecule by the number of atoms in the molecule. This number is equal to the total number of atoms present in a molecule. It is measured in grams.

Molar mass is calculated by multiplying the molecular weight of a compound by its total number of atoms (the sum of all its molecules). It is measured in grams per mole.

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