Final answer:
The balloon with more air will have both greater mass and larger volume. If filled with helium, the balloon will deflate faster than if it is filled with air due to helium's effusion rate. Pressure differences also come into play, as seen when gas flows from a smaller to a larger balloon when connected.
Step-by-step explanation:
When comparing two balloons where one has more air inside of it than the other, we should look at their mass and volume. The balloon with more air will have a greater mass because there are more molecules of air, each with a certain mass, inside the balloon. As for volume, the balloon with more air will also have a larger volume, considering that it is inflated more. However, if these balloons are inflated with helium, over time, helium's smaller molecules diffuse through the balloon material faster than air, resulting in the helium balloon deflating quicker, as shown in various physics experiments.
Another factor to consider is the pressure exerted by the gas inside the balloons. According to the ideal gas law, assuming temperature and the amount of substance remain constant, the pressure a gas exerts is inversely proportional to the volume of the container it's in. Therefore, a smaller balloon might have a higher internal pressure compared to a larger one. As a consequence, opening a connection between two balloons with different sizes would result in gas flowing from the balloon with higher pressure to the one with lower pressure until equal pressure is achieved.