Use the combined gas law or ideal gas equation please

Question

How many moles of gas are in a 30.0 liter scuba canister if the temperature of the canister is 300 K and the pressure is 200.0 atmosphere? - Show Work

Answer 1

Using the ideal gas equation:

PV=n(x)RT ⇒ n(x)=PV/RT

From the question we have:

P=200.0 atm
V=30.0 L
T=300 K
Considering that

R=0.082 L atm K^(-1) (mol)^(-1)
Then we have:

n(x)=(200.0 atm*30.0 L)/(0.082 L atm K^(-1) (mol)^(-1)*300 K)

n(x)=243.9 mol