Determine the number of atoms in 3.54 mol s. 2.13 x 1024 1.70 x 1024 1.70 x 1023 2.13 x 1023

1 mol = 6.022 x 10^23 atoms

3.54 mol * (6.022 x 10^23 atoms / 1 mol) = 2.13 X 10^24

The answer is A

Helium balloons are made of less porous material. Air is a mixture of oxygen and nitrogen molecules which are much larger and heavier than helium atoms that is why they deflate quicker than air filled balloons.