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500 g H2 = 248 moles
248 moles occupies 5555.5 liters at STP
15 cubic meter = 15x100^3 cm^3 = 15000 liters
P = 0.366 atm
T = 291 deg K
n = 248 moles
V = 248 moles x 0.08206 x 291 deg K / 0.366 atm
V = 16181 L (16.181 m^3) which is greater than the maximum capacity of the ballon.
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