• Naturally occurring iridium, Ir is composed of 2 isotopes 191IR and 193IR in the ratio 5:8. The relative mass of 191IR and 193IR are 191.02 and 193.025 respectively. Calculate the relative atomic mass or iridium.

           (Ans : 192.254)

  • In a certain experiment, 14.6g of SbF3 was allowed to react with CCl4 in excess. After the reaction was finished, 8.62g of CCl2F2 was obtained. 
               3 CCl4     +     2 SbF3  ----> 3 CCl2F2    +    2 SbCl3
             
         [ Ar Sb = 122, F = 19, C= 12, Cl = 35.5 ]
     
    a)  What was the theoretical yield of CCl2F2  in grams ?
    b)  What was the percentage yield of CCl2F2 ?

          Ans : a) 11.6 g                      b) 74.31 %