How many hudrogen molecule are there in 10grams of hydrogen?

Answer 1

1 mole H2 = 2.016g H2 = 6.022 x 1023 molecules H2

10g H2 x 1mol H2/2.016g H2 x 6.022 x 1023 molecules H2/1mol H2 = 3 x 1024 molecules H2 (rounded to 1 significant figure)

Answer 2

There are approximately 1340 molecules of hydrogen in 10 grams of hydrogen.