Question

How many atoms are there in 1.3 x 10^22 molecules of N(O)2

Answer 1

1 molucule of NO₂, have 1 atom of N, and 2 atoms of O, therefore, 1 molecule of NO₂ have 3 atoms.

1 molecule of NO₂--------------------3 atoms
1.3 * 10²² molecules----------------- x

x=(1.3 * 10²² molecules * 3 atoms) / 1 molecule of NO₂=3.9 * 10²² atoms.

Answer: in 1.3 * 10²² molecules of NO₂ there are 3.9 * 10²² atoms.