Answer: 277.8 L
Explanation: Use Ideal gas law equation:
PV= nRT
At STP: P= 1atm T = 273 K
V= nRT/ P
= 12.4 moles He ( 0.08205 L.atm/mole.K) ( 273 K) / 1 atm
= 277.8 L
5.7m questions
7.4m answers