Question

The molecular mass of a substance indicates the number of times one
molecule of a substance is heavier than 1/12 of C-12 atom. It is equal to the
sum of atomic masses of all the atoms present in a molecule. Depending on
the number of atoms of same or different elements present In the molecule, it
can be monoatomic, diatomic, triatomic, tetratomic or a polyatomic
molecule
(a) Give two examples of a polyatomic molecule.
(b) How will you calculate the total number of molecules in 4 moles of Sodium
Chloride?
(c) Calculate the percentage composition of oxygen in FeSO4 .(Atomic Mass of
Fe=56u)
Or
How will you convert 20g of Calcium hydroxide into moles?

Answer 1

Answer:

The molecular mass or molecular weight is the total mass of a compound. It is equal to the sum of the individual atomic masses of each atom in the molecule.