Determine the pressure in a 125-L tank containing 56.2 kg of oxygen gas at 25 °C.

Question

So, PV=nRT

I convert 25 °C to 298.15 K
Do I have to convert anything else?
What else do I do?

Answer 1

Convert 56.2 kg oxygen to moles = n.
n = grams (not kg)/molar mass.