A weather balloon contains 8.80 moles of helium at a ppressure of 0.992 atm and a temperature os 25 C at ground level. What is the volume of the balloon under these conditions?

We can use the ideal gas law equation to find the volume of the balloon.

PV = nRT

where

P - pressure - 0.992 atm x 101 325 Pa/atm = 100 514 Pa

V - volume

n - number of moles - 8.80 mol

R - universal gas constant - 8.314 Jmol⁻¹K⁻¹

T - temperature in kelvin - 25 °C + 273 = 298 K

Substituting these values in the equation

100 514 Pa x V = 8.80 mol x 8.314 Jmol⁻¹K⁻¹ x 298 K

V = 217 L

volume of balloon is 217 L