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Intro Chemistry Question

Chemistry
Tutor: None Selected Time limit: 1 Day

If you filled up 3 balloons with equal volume of hydrogen, argon, and carbon dioxide gas all at the same temperature and pressure, which balloon would weigh the most? The least?

Aug 7th, 2014

Your Answer

hydrogen is a diatomic molecule so it's formula is H₂ (atomic mass of 2 grams/mole), argon is a noble gas so it's not bonded to any other atom and it's formula is Ar (atomic mass of 18 grams/mole), and carbon dioxide has the formula CO₂ (atomic mass of 44 grams/mole).
Further recall that we can assume that all are ideal gases since all are pure gases.
All ideal gases follow:
PV=nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant
T is the temperature in Kelvin
Now notice that P, V, T and R are all constant and equal for all 3 gases making the n for all 3 gases equal.
Since CO₂ weighs the most per mole it will be the heaviest of all 3 gases, since H₂ weighs the least per mole it will be the lightest of all 3 gases.

Aug 7th, 2014

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