Question

How many moles of gas are in a 30 liter scuba canister if the temperature of the canister is 27°C and the pressure is 20,265 kPa?

Answer 1

$PV=nRT$

$n = {PV \over RT}$

R =0.0821 ${ Latm \over molK}$

$n = {{0.2 atm \times 30 L} \over 0.0821 \times 300 K}$

n = 0.24 moles