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QUESTION
Q57) The number of oxygen atoms in 4.4 g of CO2 is ... [ CBSE PMT 1990]




SOLUTION

Molecular weight of CO2=44 g
4.4 g of CO2=0.1 mole
Now on CO2 have two atoms of Oxygen
Thus number of atom of Oxygen=2×0.1=0.2 moles
or 0.2×6.023×1023=1.2 × 1023
Answer: (a)