slevey,+ideal+gas+law.

ideal gas law and the ideal gas constant.
the ideal gas law is the mathematical relationship among pressure, volume, temperature, and the number of moles of a gas.

//this is how the law is expressed:// PV = nRT.

P = pressure. V = volume. n = number of moles. R = a constant [.0821]. T = temperature.

__**the ideal gas constant**__//:// R is the ideal gsa constant. the value of R depends on the units chosen for pressure, volume and temperature. we will use .0821 as our unit for the constant R.

what is the pressure in atmospheres exerted by a .500 mol sample of nitrogen gas in a 10 L container at 298 K?
 * here is a practice problem:**

//fill in your variables:// V of N2 = 10 L. n of N2 = .500 moles. T of N2 = 298 K. P of N2 = unknown. R = .0821.

//rearranging the equation to find the unknown:// we can rearrange the law so we can find pressure, like this: __nRT__ = P V

//fill in the correct values for the variables:// __(.500 moles)(.0821 atm)(298 K)__ = 1.22 atm. 10 L

[problem from page 385 in the chemistry textbook.]

back to the main page.