Question

Calculate the number of molecules in 18 moles of N2 molecules .​

Answer 1

Molecular weight of N2 contains NA molecules

(Molecular weight of N2 = 28 gram)

(NA molecules = 6.023* 10^ 23 molecules)

28 gram of N2 contains 6.023* 10^23 molecules

1 gram of N2 contains 6.023* 10^ 23/ 28 molecules = 2.15* 10^ 22 molecules

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Answer 2

18 × 6.022 × $10^{23}$

144.396 × $10^{23}$

1.44396 × $10^{25}$

Hope you got it.