Calculate the number of ions and total charge in 3 gram CO3^2-

Given, Mass of carbonate = 3g

As we know,

The molar mass of carbonate ion is 60 g per mole.

This means mass of 1 mole of carbonate ions = 60 g

 

 

1 mole = 6.022×10²³ 

 

The number of ions in 3g = 0.05×6.022×10²³ = 0.3011×10²³

 

In a carbonate ion there are 3 oxygen atoms and one carbon atom

 

Therefore, 

Number of carbon atoms in 3g of carbonate = 1 × 0.3011×10²³ =0.3011×10²³

Number of oxygen atoms in 3g of carbonate = 3 × 0.3011×10²³ =0.9033×10²³

 

And the charge on carbonate ion is -2

 

Therefore total charge on 3g of carbonate ions = (-2) × 0.3011×10²³ =-0.6022×10²³