Question

13. Number of atoms in 1 ml of ammonia gas at STP is
(1) 2.7 * 1019 127 1.08 * 1020
(3) 10.8 * 1020
(4) 5.4 x 1019
​

Answer 1

V = 1ml

Vol at stp = 22.4 lit = 22400ml

Moles = 1/22400 =1/224×10^-2

No. Of molecules= 10^-2/224 × 6.022× 10^23

No. of atoms(4) = 4 × 10^-2/224 × 6.022 × 10^23

=0.107×10^21

=1.07×10^20