Calculate the number of atoms present in 2.8 g of N2molecule.
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No of moles= mass/molar mass
= 2.8/ 14×2
= 2.8/28= 0.1 moles
No of atoms= no of moles× Avogadro number
= 0.1 × 6.022× 10^23
= 6.022 × 10 ^22
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