# chemistry- thank you

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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 -

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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