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www.thoughtco.com/definition-of-formula-mass-605144

A related term you should know is relative formula mass (relative formula weight). This simply means the calculation is performed using relative atomic weight values for the elements, which are based on the natural isotopic ratio of elements found in Earth's atmosphere and crust.

www.onlinemathlearning.com/molecular-mass.html

The relative formula mass of a substance is the sum of the relative atomic masses of the elements present in a formula unit. The symbol for relative formula mass is M r. If the substance is made of simple molecules, this mass may also be called the relative molecular mass.

www.bbc.com/bitesize/guides/z3jvtv4/revision/2

The relative formula mass, symbol M r, is used for a substance made up of molecules. This is calculated by adding up the relative atomic masses of all the atoms in the formula. for the substance ...

www.aplustopper.com/relative-atomic-mass-relative-molecular-mass-element

What is the Relative Atomic Mass and Relative Molecular Mass of an Element? Relative Atomic Mass Formula The earlier development of relative atomic mass An atom is very tiny. Therefore, it is impossible to determine its mass by weighing. So, chemists compare the mass of an atom with a standard atom. The mass of an […]

www.bbc.com/bitesize/guides/zpfjcj6/revision/5

Relative formula mass is given the symbol M r. If the substance consists of molecules, the term relative molecular mass can be used instead. The M r of a substance is the mean mass of one of its ...

www.quora.com/What-is-the-difference-between-relative-molecular-mass-and...

It's basically the same. Relative atomic mass is the summation of the individual masses of the atoms. This mostly applied to molecular compounds like water, ammonia, etc. That is, atomic mass of molecules. Formular mass applies to ionic compounds....

en.wikipedia.org/wiki/Relative_atomic_mass

Relative atomic mass (symbol: A r) or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant.The atomic mass constant (symbol: m u) is defined as being 1 / 12 of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence ...

sciencing.com/how-to-find-relative-mass-13710549.html

Find the relative mass of any atom by adding the number of protons to the number of neutrons. Hydrogen has a relative atomic mass of 1, and carbon-12 has a relative atomic mass of 12. Isotopes of the same element have different numbers of neutrons, so you need to calculate for one specific isotope.

www.quora.com/What-is-the-difference-between-molecular-mass-and-formula-mass

There is a cyclopean difference between molecular mass and formula mass. 1. Molecular mass is the mass of a given molecule or compound but now the clinch here is that it remains neutral despite the presence of zillions of molecules. For ex: Molecu...