Tim wants to store 0.122 moles of helium gas at 203 kPa and 401 K. Which is the volume of the helium gas needed for storage?

A. 0.240 L

B. 0.510 L

C. 2.00 L

D. 3.37 L

The volume of Helium gas needed for storage is 2.00 L (answer C)

calculation

The volume of Helium is calculated using ideal gas equation

That is Pv = nRT

where;

P (pressure) = 203 KPa

V (volume) = ?

n (number of moles) = 0.122 moles

R (gas constant) = 8.314 L. Kpa/mol. K

T (temperature) = 401 K

make V the subject of the formula by diving both side by P

V=nRT/p

V={[0.122 moles x 8.314 L. KPa/mol. K x 401 K] / 203 KPa} = 2.00 L