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

1 Answer

  • 1 decade ago
    Favorite 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.

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