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The general formula for calculating the Average Molecular Weight AMW

# The general formula for calculating the Average Molecular Weight AMW

2022/04/06
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[Abstract]:
Average Molecular Weight AMW, a proper term for chemical calculations, the sum of the relative atomic masses of the atoms in the chemical formula is the relative molecular mass, represented by the symbol Mr.

Average Molecular Weight AMW, a proper term for chemical calculations, the sum of the relative atomic masses of the atoms in the chemical formula is the relative molecular mass, represented by the symbol Mr. The general formula for calculating the Average Molecular Weight AMW is M(average)=mtotal/ntotal. Under the general formula, it can be calculated according to the proportion of the mixture in the material fraction of each component in the mixture, and can also be calculated according to the molar mass and density.
Common ways to calculate Average Molecular Weight AMW:
1. Calculate according to the proportion of each component in the mixture to measure their contribution to the relative molecular mass.
The share is calculated by the amount of the substance in the mixture (for gas, it is equal to the volume fraction), and its mathematical expression is:
Assuming that the components of a mixture are A, B, C..., their relative molecular masses are MA, MB, MC... , then the average relative molecular mass of this mixture is: MA*xA+MB*xB+MC*xC…