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Q.

The formula unit mass of a substance is-

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a

a sum of the atomic masses of all atoms in a formula unit of a compound.
 

b

a sum of the molecular masses of all atoms in a formula unit of a compound.
 

c

Formula based method to obtain atomic masses
 

d

 a sum of atomic numbers of all atoms

answer is A.

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Detailed Solution

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  • The formula unit mass of a substance is defined as the sum of the atomic masses of all atoms in a formula unit of a compound.
  • Formula unit mass is calculated in a similar manner to that of molecular mass.
  • The only difference between formula unit mass and molecular mass is that the word formula unit is used for those substances whose constituent particles are ions.

 

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