weather ballon released @30C, 15L air @1atm. Rises to upper atmos to 18C, new V? 3L flask of H @1atm, 30C, stored in flatbed truck, # mol?

Question

Roger the Mole · Accepted Answer

Since the pressure at altitude is not given, you must make the unrealistic assumption that the pressure is constant:
(15 L) x (18 + 273) K / (30 + 273) K = 14 L

n = PV / RT = (1 atm) x (3 L) / ((0.08205746 L atm/K mol) x (30 + 273) K) = 0.1 mol 
[The answer would be the same if the flask was stored in a Smart car or on the moon.]

weather ballon released @30C, 15L air @1atm. Rises to upper atmos to 18C, new V? 3L flask of H @1atm, 30C, stored in flatbed truck, # mol?

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