• 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=...