Neutral Buoyant Balloon

You must write down your procedure before you will get a balloon to test your calculations. Neatness will be a factor in your grade. Use normal laboratory format for you write up. Basic idea is this. Determine the volume of a balloon. Use atmospheric pressure, room temperature and the ideal gas law to determine the number of moles in your balloon. The number of moles represents both the helium in the balloon and the air the balloon displaces. The difference in mass of the balloon filled with helium and a the mass of air displaced will allow you to figure out the mass needed to add to the helium balloon in order for it to be neutral buoyant. Test your calculations with actual mass added to your balloon.