The two balloons shown in the figure have the same volume, and are at the same temperature and pressure. Which balloon has the greater number of gas particles, and why? 
A) The Ar balloon has fewer molecules than the He balloon.
B) The density of the Ar balloon is greater than the density of the He balloon.
C) The mass of the He balloon is greater than the mass of the Ar balloon.
D) The CO2 balloon is more buoyant than the O2 balloon.
E) The He balloon has fewer moles than the He balloon.
Correct Answer:
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