Question

How many atoms of oxygen are present in 300 gram of csco 3?

Answer 1

Molecular mass of calcium carbonate=40+12+48
=100g.
1mole of cal. carbo.-3mole of oxygen atom.
100g of cal.carbo. contain -3×6.022×10^23 oxygen atom
300g of cal.carbonate contain -how many oxygen atom?
=300×3× 6.022^23/100
=54.205×10^23oxy.atm