Answer:
0.641 moles
Explanation:
Apply the ideal gas law: PV = nRT
Since we're looking for number of moles, solve for n:
n = PV / RT
Plug in our values given: 4.44 atm, 5.00 L, 0.08206 (ideal gas law constant for atms), and 422.15 K (149˚C in K for our ideal gas law equation):
n = (4.44 * 5.00) / (0.08206 * 422.15) = 0.641 moles (3 significant figures)