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QUESTION
Q37) If 1021 molecules are removed from 200mg of CO2, then the number of moles of CO2 left are ... [ IIT 1983]




SOLUTION

Molecular weight of CO2=44 g
∴ 200mg=4.54 ×10-3 mole
1021 molecules=1021 / (6.023×1023)=1.66×10-3
∴ Number of molecules left=(4.54 - 1.66 ) 10-3
Number of moles left=2.88 ×10-3Answer: (a)