Q. A mixture of one mole each of H2, He and O2 each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of H2 is 2 atm, the total pressure of the gases in the cylinder is:

  (A) 6 atm                 (B) 14 atm                         (C) 38 atm                              (D) 22 atm

 

Ans. (A)

Explanation:

According to Dalton's law of partial pressure,  Pi = Xi × PT 

Pi → partial pressure of the ith component

Xi → mole fraction of the ith component

PT →total pressure of mixture

 PH2=nH2nH2+nHe+nO2PT2 atm=11+1+1PTPT=2×31=6 atm