1.

Define formula unit mass. How is it calculated? Write the formula unit mass of (NH4)2SO4. [Given atomic mass: N = 14 u, H= 1 u,S = 32 U.O = 16 u].

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 

= 14 x 2 + 4 x 2 + 32 + 16 x 4

= 132u



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