Mole ConceptHard

Question

In which of the following pairs, 10 g of each have an equal number of molecules ?

Options

A.N2O and CO
B.N2 and  C3O2
C.N2 and CO
D.N2O and CO2

Solution

Equal number of molecules are present when moles are same. For the same mass the molecular weight has to be same.
Hence Mw of N2 = Mw of CO = 28 g
Mw of N2O = Mw of CO2 = 44 g

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