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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: vmaniscalco on March 01, 2006, 12:41:01 PM

Title: PV=nRT
Post by: vmaniscalco on March 01, 2006, 12:41:01 PM

Hey everyone Im new to this forums but I am having some problems with my chemistry and I was wondering if someone could help me to figure this out. So I just cannot figure what to use for R what do i put in for R when i am trying to solve for moles and I have ATM's for my pressure..? thanks

Title: Re:PV=nRT
Post by: Albert on March 01, 2006, 12:54:26 PM

R = 8.20575 10^-2  L atm K^-1 mol^-1

Title: Re:PV=nRT
Post by: vmaniscalco on March 01, 2006, 06:50:35 PM

So then What do I use for L?

Title: Re:PV=nRT
Post by: AWK on March 02, 2006, 01:21:06 AM

L means volume of 1 liter (or 1 dm³ - hence in your calculation you should use volume in liters

Title: Re:PV=nRT
Post by: xiankai on March 03, 2006, 07:47:11 AM

there are many variations of R, all depending on what units are being considered. so depending on the context, u may want to us other values for convenience.

http://en.wikipedia.org/wiki/Gas_constant

Title: Re:PV=nRT
Post by: Donaldson Tan on March 03, 2006, 06:51:20 PM

Perfect Gas Equation: PV = nRT

P: pressure, SI Unit: Pa
V: volume, SI Unit: m³
n: amount of substance, SI Unit: moles
R: molar gas constant, 8.314 J/K.mol
T: thermodynamic temperature, SI Unit Kelvin

This equation is otherwise known as the Ideal Gas law. It relates the pressure and volume to the temperature and the mass of the gas. A gas that behaves according to this equation is called a perfect/ideal gas.