=] asked in Science & MathematicsChemistry · 1 decade ago

chemisty question---391G of NH3 @ STP?

i dont understand this question.. Please help

It says

Given: 391 g NH3 @ STP

Find: # of N atoms

# of H atoms

please help! thank you! SOOO much!

1 Answer

  • 1 decade ago
    Favorite Answer

    STP is standard temperature and pressure.

    molecular wt of NH3 is 17.

    so avogadro number of molecules of NH3 is present in STP.

    so 17 gms of NH3 contains 6.022X10^22 N atoms

    391 gms of NH3 contains..6.022X10^22X391/17 N atoms

    for H

    17 gms of NH3 contains 3X6.022X1o^22 H atoms

    391 contains 3X6.022X10^22X391/17 H atoms

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