What is the change on the subatomic particles represented in figure 4-3? assuming all the particles in the nucleus are visible, what are the atomic and mass numbers of the atom shown?

Explanation:

Atomic number means the number of protons an atom holds. Whereas mass number equals (number of protons + number of neutrons).

The given figure shows that there are 9 neutrons and 8 protons.

Therefore,

 mass number of the atom = number of protons + number of neutrons

                             = 8 + 9

                             = 17

Hence, mass number of the atom is 17 and atomic number of the atom is 8.

Explanation:

The given data is as follows.

         Refractive index of mixture = 1.456

        Refractive index of hexane = 1.375

        Refractive index of toulene = 1.497

Let mole fraction of hexane =

and, mole fraction of toulene =

Also,        

or,            

Hence, calculate the mole fraction of hexane as follows.

        refractive index mixture= mole fraction hexane × ref index hexane + mole fraction toluene × ref index toluene.

              1.456 =

               1.456 =

               0.081 =

                    =

                                = 0.66

Since,    

                          = 1 - 0.66

                          = 0.34

Thus, we can conclude that mole fraction of hexane in your sample is 0.34.