Question

Calculate the number of moles in 100 g of CaCo3

Answer 1

⭕️given mass of CaCO3 
=100g

⭕️ CaCO3 mass Ca=40u, C=12u, O=16u


⭕️No. of moles
=Given mass /molar mass
                       
=100/100
                     
=1mol


⭕️ To find the molecular mass You add up molar masses of Ca, С and o3

⭕️ They are 40.1, 12 and 16 g/mol respectively.

⭕️So the molar mass of CaCO3 is:-
= 40.1+12+3x16
=100.1 g/mol.




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Answer 2

CaCO3 → Ca 2+ + CO3 2-

Every mol of CaCO3 has 1 mol of Ca2+.

No. of Moles = Mass/ Molar mass

No. of Moles= 100/ 100
= 1mol

Molar masses of CaCO3= 40u, 12u, 16u

Molecular Mass= 40.1+12+3x16
=100.1g/mol