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ICSE Class 10 Answered

Calculate the number of ions and total charge in 3 gram CO3^2-
Asked by Anjalimanoj207 | 20 Jun, 2019, 07:43: PM
answered-by-expert Expert Answer
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
 
Number space of space moles space equals fraction numerator Given space mass over denominator Mola space mass end fraction space equals space 3 over 60 space equals space 0.05 space mol
 
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
Answered by Ramandeep | 21 Jun, 2019, 12:18: PM

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