Question

If a balloon is filled with He, Ne, and Ar gases at a total pressure of 2.0atm, what is the partial pressure of argon if the partial pressures of helium and neon are both 0.25atm each?

Answer 1

P=P_He + P_Ne + P_Ar

2=0.25+0.25+P_Ar

P_Ar=1.5

For more accurate calculations, use the formula

P =(nRT/V)_He + (nRT/V)_Ne + (nRT/V)_Ar 

Please provide temperature and mass