Chem Notes 1st Year

                                                     Important Questions

Q What are the faulty assumption of the K M T ?
Ans: According to van der Waal (1873) two postulates of Kinetic Molecular . The gases are faulty which under as
                      There is no force of attraction among molecules of a gas
                       The actual volume of gas molecules is negligible as compared to the volume of vessel.

Q Define the pressure Give Its unis.
Ans: The force on a unit area is called pressure
            The SI unit for the pressure is Nm-2 or the Paascal.

Q Define the partial pressure and how it can be calculated?
Ans: The individual pressure exerted by each gas in mixture of non reacting gasses is called Partial pressure.
              Let us suppose that we have a mixture of Gas A and B This mixture is enclosed in a container having volume (V). The total pressure is one atm. The number of moles of the gas A and B are nA and nB respectively. If they are maintained at temperature T then
               i         Pt V = nt RT       Equation for the mixture of gasses

                ii        Pa V = nA RT     Equation for gas A

                 iii       Pb V = nB RT     Equation for gas B
 divided Eq ii by eq i
                                    Pa V        nA RT
                                    ___   =     ____
                                   Pt V          nt RT
Pa   nA
_  = __
Pt    nt
                              Pa = nA
                                      __ Multiply Pt
                                      nt
Pa= Xa multiply Pt
Pb= Xb Multiply Pt       
   
    

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