formula unit of mass define it the following terms
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The formula mass of a substance is defined as the sum of the atomic masses of constituent atoms in an ionic compound. This is generally used for ionic compounds which do not contain discrete molecules, but ions as their constituent units.
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Hey mate here is your answer :)
Formula unit mass is the sum of the atomic masses of all atoms present in a formula unit of a compound. It is calculated by adding the atomic masses of all the atoms present in one formula unit. Formula unit mass of
(NH4)2so4 = 14x2 + 4x2 + 32 + 16x4 = 132 u
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