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Q)

# 18g of oxygen contain as many atoms as in

18g of oxygen contain as many atoms as in

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A)
Molar Mass of Oxygen $(O_2)$ = 32g

No of moles = Mass/Molar Mass

Given Mass = 18g

No. Of moles = 18/32 = 0.56moles

1 mole has $6.023\times 10^{23}$ molecules or atoms

So 0.56 moles have 3.37\times 10^{23} molecules or atoms