Posted by **Anthony** on Sunday, October 31, 2010 at 12:07pm.

What is the maximum weight (in grams) that 15 party balloons, each filled with 2 L of helium, can lift at STP? You can assume the weight of the balloon rubber is negligible and the outside air can be treated as pure nitrogen.

- chemistry- thank you -
**bobpursley**, Sunday, October 31, 2010 at 12:11pm
lift each has:

lift=(densityair-densityhelium)Volume

Note. Normally, one would have multiplied all that by 9.8N/kg. But your teacher has asked for lift of "weight" on grams. Hmmm. Mass is not weight, but forgive her.

now, density air= densityN2=mass/volume

or = 28g/22.4liters

and for He, 4g/22.4liters

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