Question

6. Assertion : The molecular mass and formula unit mass of a substance is the sum of
atomic masses of all the atoms in the molecular formula or formula unit of a
compound
Reason: The only difference between the molecular mass and formula unit mass is
that, former is for molecular compounds (covalent compounds) and latter is for ionic
compounds. However, their numerical value is the same.​

Answer 1

Answer:

For molecular mass of O its atom number is 8 so do 8 mul by 8=16

Explanation: