How would you solve gas laws problems with the given "at STP"?

1 Answer
Meave60
Nov 28, 2015

Refer to the Explanation.

Explanation:

The most current recommendation for #"STP"# is #0^"o""C"# #("273.15 K")#, and #"10"^5 "Pa"##("100 000) Pa")#, which most people write as #"100 kPa"# because its easier to work with, but is identical to #"10"^5 "Pa"#. Using these values, the molar volume of a gas is #"22.710 980 L/mol"#.

So if you are asked to find the volume of a gas at STP, you would use #"273.15 K"# and #"100 kPa"#.

However, many people are still using #0^"o""C"# (#"273.15"#) and #"1 atm"#. Using these values, the molar volume of a gas is #"22.414 L/mol"#.
https://en.wikipedia.org/wiki/Molar_volume

Whichever value you choose to use for STP, make sure the temperature is always in Kelvins (C+273.15), and that the gas constant, R, has the same units that correspond to your temperature and pressure, and be sure you have the correct molar volume if needed.
https://en.wikipedia.org/wiki/Gas_constant

http://en.citizendium.org/wiki/Reference_conditions_of_gas_temperature_and_pressure#cite_note-NISTCODATA-10

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