Homework Help

How many atoms of Hydrogen are in 67.2 L of H2 at STP?

user profile pic

bahadur | Student, Undergraduate | (Level 3) eNoter

Posted November 1, 2011 at 10:54 AM via web

dislike 0 like

How many atoms of Hydrogen are in 67.2 L of H2 at STP?

1 Answer | Add Yours

user profile pic

ndnordic | High School Teacher | (Level 2) Associate Educator

Posted November 1, 2011 at 9:13 PM (Answer #1)

dislike 1 like

One mole of any gas at STP has a volume of 22.4 L. So first determine the number of moles of gas you have.

67.2/22.4 = 3 moles of H2

One mole of any substance contains Avogadro's number of atoms = 6.022 x 10^23 atoms.

So multiply number of moles x number of atoms/mole = 1.8066 x 10^24 atoms of H2.

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes