Question

. No. of atoms in 4.25 g of NH3 is
1) 6.023 * 10'2
2) 4 x 6.023 x 10'23
3) 1.7 x 10'24
4) 4.25 x 6.023 x 10'23​

Answer 1

Explanation:

mass given of NH3 is=4.25gm

no. of mole=weight /molar mass

molar mass of NH3= 14+1×3

=14+3==17

mole=4.25/17==0.25 mole

in 1 mole there is 6.023×10^23 atom is there

so in 0.25 mole it will be

6.023 × 10^23× 0.25

==1.5 ×10^23