8 g of O2 has the same number of molecules as [a] 7 g of CO [b] 11 g of CO2 [c] 7 g of N2 [d] all of these
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molecular mass of O2=2×16=32
no of moles of O2 in 8 g=0.25mol
molecular mass of CO2=12+(16×2)
=12+32
=44
no of mole of CO2 in 11 g= 0.25 mol
therefore 7 g of CO2 will have same number of moleculesas 8 gram of O2
ie. 1.5055×10^23 molecules
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