Which has more number of atoms and why?
100g of N2 or 100g of NH3​

100g of NH3 has more number of atoms

Explanation:

(i) 100g N2 contains =100/28 moles

Number of molecules=100/28×6.022×10^23

Number of atoms =100/286.022×10^23×2=43.01×10^23

(ii) 100g NH3=100/17 moles

Number of molecules =100/17×6.022×10^23

Number of atoms​       =100/17×6.022×10^23×4 atoms

                                    =141.69×10^23

∴ NH3 would have more atom...

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pure substance: iron,copper

impure substance: water,charcoal

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