# When using PV=nRT, what is STP?

Standard temperature pressure? The volume is 22.4, how about the temperature in K and pressure in atm?

Relevance

STP is standard temperature and pressure. Standard temperature is 0°C or 273 K. Standard pressure is 1 atm or 101.3 kPa or 760 mmHg.

Note: The volume of one mole of a gas at STP is 22.4 L. If you don't have one mole of a gas the the volume is not 22.4 L.

• HPV
Lv 7

STP refers to "Standard Temperature and Pressure" which are 1 atm and 0 C. If you put those values in the ideal gas law, you find that

PV = nRT

V/n = RT/P = (0.0821)(273) / (1) = 22.4 L.

So at STP the molar volume of any gas is 22.4 L. I never liked using 0 C because it's freezing! If you recalculate V/n at 25 C (77 F) you get a molar volume of 24.2 L.

Again, the other answers are correct.

BTW, I learnt about STP in high school, but never used it again in a lifetime in chemistry. It is nearly always more straightforward to start from

PV = nRT

• 4 years ago

What Is Stp