Question

One mole of hydrogen atoms contains 6.022 x 1023 atoms (Avogadro’s number) and occupies a volume of 22.4 L. How many hydrogen atoms are contained in 25 mL of this gas?

Answer 1

Answer:

The answer to your question is 6.72 x 10²⁰ atoms

Explanation:

Data

Avogadro's number = 6.022 x 10²³ atoms

Volume = 22.4 L

Volume 2 = 25 ml

Number of atoms = ?

Process

1.- Convert mL to L

                              1000 mL  ----------------- 1 L

                                  25 mL ------------------  x

                                  x = (25 x 1) / 1000

                                  x = 25 / 1000

                                 x = 0.025 L

2.- Use proportions and cross multiplication to find the answer.

                                 22.4 L ----------------- 6.023 x 10²³ atoms

                                 0.025 L --------------   x

                                 x = (0.025 x 6.023 x 10²³) / 22.4

                                 x = 1.51 x 10²² / 22.4

                                 x = 6.72 x 10²⁰ atoms