How many atoms of Hydrogen are in 67.2 L of H2 at STP?
- ChemTeamLv 71 decade agoFavorite Answer
You can use molar volume since the system is at STP.
67.2 L / 22.414 L/mol = moles of H2 gas
Moles of H2 gas times 6.022 x 10^23 mol^-1 = molecules of H2
Finally, since there are two atoms of H per molecule:
molecules of H2 times 2 = the answer you seek.