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by level headed on November 17th, 2009
You have to look up the atomic weight in the periodic table. It's a gas so it takes the shape of the container. Then I believe, you have to figure out the volume of the container.
by Outta-here on November 25th, 2009
Wiegh a balloon. Fill it with helium. Tie a string to it and suspend weights until it hovers. Wiegh the string and weights. subtract the weight of the balloon. My students do this in class.
by - MojoThunder - on November 17th, 2009
weigh an empty balloon ... fill it with helium and tie it off ... then weigh it again ... of course, since its going to float up, you may have to put the scale on the ceiling
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by Sage Chexie at your service on November 18th, 2009