Question

If an ideal gas has a pressure of 7.05 atm, a temperature of 379 K, and has a volume of 54.75 L, how many moles of gas are in the sample?

Answer 1

by using ideal gas equation

Explanation:

ideal gas equation : `P*V = n*R*T`
P : pressure
V : volume
n : moles of gas
R : universal gas constant
T : temperature

R has different values for in different units
R = 8.314 J/mol-k
R = 0.0821 L-atm/mol-k
and so on.
here we will use R = 0.0821 L-atm/mol-k
now substitute given values in ideal gas equation
`7.05 * 54.75 = n * 0.0821 * 379`
n = 12.4 mol