Hi there,
NH3 has the weight of 17.03 grams, and SF6 has the weight of 146.06 grams 
so in total, there is 163.09 grams
Hope this helps :P
        
             
        
        
        
Catalyst can speed up chemical reaction without being used up or involved in thr reaction..
        
             
        
        
        
The greatest aqueous freezing point is (D) 0.10 KCI
        
             
        
        
        
Sodium chloride (NaCl), whose only changes about 5g/100mL water over that entire range 100°C)