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(a) What is Avogadro constant? 

(b) Calculate the number of particles present in 56 gm of N2 molecule. 

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(a) The number of atoms or molecules in 12 gm of carbon-12 ( in a mole of a substance) is called as Avogadro constant (6.022 × 1023

(b) Number of molecules(N) = Given mass X Avgadros no / Molar mass

Molar mass of 1 mole of N2= 14 × 2 =28 

N = 56/ 28 ×6.022 × 1023 

N = 12.044 × 1023 

Hence there are 12.044 × 1023 particles present in 56 gm of N2

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