how many mols of gas will occupy 6.75 m^3 at 65°C and 3.28 x 10^5 Pa?

Answer 1

Convert cubic meters to cc.
6.75 m^3 x (100 cm/1m)(100 cm/1m) x (100 cm/m) = 6750000 or 6750 L.
You know that 1 mol occupies 22.4 L
6750 L x (1 mol/22.4L) = ?

Answer 2

p v = n R t ... n = (p v) / (R t)

convert ºC to ºK

make sure the R value has the correct units

Answer 3

Scott's answer is better than mine; I didn't read the entire question. My answer is good ONLY for STP and this problem is not at STP. MY eye sight let's me see a limited field and I didn't see the T and P listed. Sorry about that.