Question

Calculate the number of nitrogen atoms in 42 g of Nitrogen​

Answer 1

GiveN :-

• There is 42 g of Nitrogen atoms .

To FinD :-

• The Number of nitrogen atoms.

SolutioN :-

42 grams of Nitrogen is given to us and we need to find the number of nitrogen atoms .We world have to find the number of moles of Nitrogen. So , for that , we know the molecular weight of Nitrogen is ,

$\sf:\implies Molecular \ Weight _{(Nitrogen)}= \gray{ 14 \ g } .$

• Number of moles of Nitrogen :-

$\sf:\implies \pink{ Number_{(moles)}=\dfrac{ Given \ weight }{Molecular\ weight }}\\\\\sf:\implies n_{(moles)}= \dfrac{ 42 g}{14 g } \\\\\sf:\implies \boxed{\pink{\frak{ Number_{(moles)}= 3 }}}$

Hence the number of nitrogen atoms will be equal to No. of moles × Avogrado's Number

$\sf = 3 \ times N_A \\\\\sf = 3 \times 6.022 \times 10^{23} \\\\\sf =\gray{\boxed{\pink{ \tt18.066 \times 10^{23} \ particles }}}$