For Any gas: P V = n R T where: P : pressure V : volume n : number of moles R : gas constant T : absolute temperature in kelvin provided that: V = 53 L S.T.P means standard temperature and pressure at which pressure is 1 atm and temperature is 273 K R = 0.08205 atm.L /mol.K So: n = [tex] \frac{P.V}{R.T} [/tex] = [tex] \frac{1atm * 53 L}{0.08205 * 273 K} [/tex] = 2.4 moles The correct answer is A) 2.4
