Question

A sample of helium gas is confined to a 44.8 Liter balloon at 0 C at 1.0 atm. What is the number of moles of helium?

Answer 1

According to ideal gas equation : PV = nRT

Here, P = pressure , here P= 1 atm

V= volume, here V= 44.8 L

n= no. of moles of Helium

R= universal gas constant= 0.08206 L.atm/K.mol

T= absolute temperature in Kelvin, here T= 273K ( 0°=273K)

Now putting this values in the ideal gas equation we get,

1 atm × 44.8 L = n × 0.08206 L.atm/K.mol × 273 K.   

Or, n = {44.8/(0.08206×273)}mol

Or,. n = {44.8/22.4) mol

Or, n = 2 mol.

So, no. of moles of Helium is 2 mole.