Question

7. Write the number of atoms of each element
in following molecules :
(a) Na2CO3
(b) CuSO4
(c) Al2(SO4)3
(d) H2SO4​

Answer 1

Answer:

1-6 atoms

2-6 atoms

3-16 atoms

4-7 atoms

Answer 2

Molecular mass of a compound is the sum of atomic masses of each element present in the molecule.

Molecular mass of a compound is the sum of atomic masses of each element present in the molecule. Molecular mass = atomic mass of Cu + atomic mass of S + (9 × atomic mass of O) + (10 × atomic mass of H) =63.5+32+9×16+10×1=249.5 gm/mole