Q:  Can you re-arrange the equation to solve for temperature?

                     mu * mH * Pgas
               T  =  ---------------
                        rho * k
         

   Q:  What is the temperature at the center of the Sun?

                     0.5 * 1.67 x 10^(-27) * 3 x 10^(16)
               T  =  ---------------------------------------
                       1.6 x 10^5  *  1.38 x 10^(-23)

        
                  =   1.1 x 10^7  K



         which is within a factor of two of most recent estimates.