example of oxide ore are hematite ,magnetite,chromite, zincite
 
 
        
                    
             
        
        
        
The  percentage  by mass  of  oxygen  in  the  compound
find  the total  mass=(  1.900+  0250 +0.850) =  3
the  percentage  mass  mass of  oxgyen/total  mass  x100
that  is  (0.850/3)  x100=28.33%
        
             
        
        
        
Answer:
energy which a body possesses by virtue of being in motion 
Explanation:
the work needed ro accelerate a body of given mass