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illidari

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## Homework Statement

A helium balloon is used to lift a load of 110 N. The weight of the balloon's skin is 50 N, and the volume of the balloon when fully inflated is 32 m3. The temperature of the air is 0°C and the atmospheric pressure is 1 atm. The balloon is inflated with sufficient helium gas so that the net buoyant force on the balloon and its load is

30 N. Neglect changes of temperature with altitude.

(a) How many moles of helium gas are contained in the balloon?

## Homework Equations

Find V from FB = mg + 30 N

PairVg = 190 N + PHeVg; V = 17.38 m3

## The Attempt at a Solution

I am confused on how you get the V=17.38 from using the equation I posted. Could someone explain that part to me.