[xeomonk]

I have a question, I am ask the find the mass helium but I am not sure what formula to use.

Find the mass of helium that can be stored in this container at 285 K

Additional information given:
A steel container of volume 0.31 L can withstand pressures up to 93 atm before exploding.

Do I used PV=nRT?

[dgolverk]

Yes. It's a simple substitution question.
You should use PV=nRT. Where R is the universal gas constant = 8.314472 J·K-1·mol-1.
V = 0.31 L
P = 93atm (1atm = 101.325Pa) So 93 atm are equal to 9423.225 kilopascals.
T = 285k

When you find the number of moles(n) of helium simply multiply it by the molar mass of helium (4.00gmol)

[xeomonk]

Gottcha, My answer came up to be 4.9 g and it's correct.

Thank you