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.

Question

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.

Answer 1

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