What is the ratio by mass of constituting element in following ionic compounds.

1) Magnesium Sulphide

2)Sodium Chloride

3)Ammonia

4)Calcium Oxide

5)Carbon dioxide

6)Water

The ratio by mass of the following compounds are as follow:

1) Magnesium Sulphide :- MgS 

Mass of Mg is 24 per mole and Mass od sulphur is 32 g per mole.

Hence the mass ratio is 3:4

similarly we can calculate for all compounds 

2)Sodium Chloride :- 23:35.5

3)Ammonia :- 14:3

4)Calcium Oxide :- 5:2

5)Carbon dioxide :- 3:8

6)Water :- 1:8