Question

Calculate number of particles present in 56gm of n2 molecule.

Answer 1

No. of moles = mass/Molar mass

Molar mass of N2 is 28

no. of moles = 56/28 = 2 moles

No. of particles = no. of moles × Avagadro no.

No of particles =
$2 \times 6.022 \times {10}^{23}$
$= 12.044 \times {10}^{23}$

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Answer 2

28gr n2 has 6.022×10^23 molecules
1 " ". ". ". (6.022×10^23)/28 ". "
now , 56 gr n2 has (6.022×10^23 ×56)/28
= 12.044×10^23 molecules