Chemistry and Gas Laws help PLEASE?!?

Find the volume, in liters, of each of the following at STP

a) 7.85g O2

b) 3.35g CO

c) 0.0159g H2S

d) 2.18 x 10^5 kg NH3

Thanks for your help!!!!!! :)

1 Answer

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  • Lexi R
    Lv 7
    1 decade ago
    Favorite Answer

    At STP (which is 0 deg Celcius and Pressure = 1 atm) 1 mole of any ideal gas occupies a volume of 22.4 L

    So volume of a gas at STP = moles gas x 22.4 L/mol

    a) moles = mass / molar mass

    moles O2 = 7.85 g / 32.00 g/mol

    = 0.2453125 moles

    volume = 0.2453125 mol x 22.4 L/mol

    = 5.495 L

    = 5.50 L (3 sig figs)

    Same method for all the others.

    (Don't forget to convert the kg in the final question to g (1 kg = 1000 g))

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