If I have an unknown quantity of gas at a pressure of 3.2 atm, a volume of 25 liters, and a temperature of 98℃, how many moles of gas do I have?

Answer 1

You should be familiar with the Ideal Gas Law: PV = nRT

You know all of the variables except n (moles). So, you can solve for that.

P = 3.2 atm

V = volume in liters = 25 L

n = moles = ?

R = gas constant = 0.0821 Latm/Kmol

T = temperature in Kelvin = 98 + 273 = 371K

PV = nRT and solving for n we have...

n = PV/RT

plug in the above values and solve for n in moles.