Answers

2016-04-01T14:12:29+05:30
Chemical formula is the symbolic representation of the composition of the compound.from it , we can know the no: and different kinds of different elements that constitute the compound.

the chemical formula is CaCo3
formula unit mass of calcium carbonate 
= atomic mass of calcium+ atomic mass of carbon + 3 
× atomic mass of oxygen
= 40u + 12u +  ( 3 × 16u ) = 100u
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2016-04-01T14:22:55+05:30
Chemical formula is a set  of chemical symbols showing the elements present in a compound and their relative proportions
formula of calcium carbonate = CaCO3
Atomic mass = 40+12+16*3
=52+48
=100u
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