Use the formula E=mc^2
energy given=<span>8.1 x 10^16 joules
</span>speed of <span>light = 3.00 × 10^8 m/s
</span>
plug in the values we'll get mass=<span>9.0 x 10-1 kg</span>
        
                    
             
        
        
        
Answer:
hi I'm sorry I can't I just need points
 
        
             
        
        
        
In comparison see it is very easy in goolge
        
             
        
        
        
Chlorine + Calcium --> Ionic Bond
Iron cannot covalently bond as it is a metal
        
                    
             
        
        
        
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