How do you calculate the formula mass of NaCl and molecular mass of CH4?
Formula mass Definition
The term “FORMULA MASS” refers to the total atomic masses of the ions contained inside a formula unit of an ionic compound.

NaCl Formula mass
Calculating the formula mass of NaCl by taking the sum of atomic masses of the ions contained inside a formula unit of an ionic compound NaCl.
Formula mass of NaCl = 1(23)+1(35.5)
Formula unit of NaCl = 58.5 a.m.u
Molecular mass Definition
Molecular mass is the sum of the atomic masses of the atoms in a molecule.
CH4 Molecular mass
Calculating the molecular mass of CH4 by taking the sum of atomic masses of the atoms in a CH4 molecule.
Molecular mass of CH4=1(12)+4(1)
Molecular mass of CH4= 16a.m.u
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