Answer:
Option B
Explanation:
Use Avogadro constant of 6.02 x 10^23
For Option A,
1.9 moles x (6.02 x 10^23) = 1.1438 x 10^24
For Option B,
5.3 moles x (6.02 x 10^23) = 3.1906 x 10^24
For Option C,
9.5 moles x (6.02 x 10^23) = 5.719 x 10^24
For Option D,
19.2 moles x (6.02 x 10^23) = 1.1558 x 10^25
Therefore, the nearest one to 3.2 x 10^24 is Option B
