Unanswered Ionic Equillibrium Questions

At 200 degree Celsius pcl5 dissociate as follows pcl5= pcl3 +cl2 .it was found that the equilibrium vapours are 62 times as heavy as hydrogen .The degree of dissociation of pcl5 at 200 degree Celsius is ...

Given: Ag(NH3)2 1Ag+2NH3, Kc=6.2*10^-8 and Ksp of AgCl=1.8*10^-10 at 298K. if ammonia is added to water solution containing excess of Agcl(s) only .Calculate the concentration of complex in 1M aqueous ammonia ...