The pair of both compounds that have the same empirical formula are C6H12O6 and HC2H3O2. The answer is letter D. <span>H2O and H2O2, BaSO4 and BaSO3 and FeO and Fe2O3 do not have the same empirical formula.</span>
        
             
        
        
        
Answer:
kidney, bladder, rectum, urethera
Explanation:
 
        
             
        
        
        
 The most concentrated solution is b
        
                    
             
        
        
        
We know 1 mole of any atom or molecules contains  atom or molecules.
 atom or molecules.
1 mole of HBr i.e 81 gm/mol contains   atom or molecules.
 atom or molecules.
So, mass of  molecules is :
 molecules is :

Therefore, mass of   molecules is 1.21 gm .
 molecules is 1.21 gm .
Hence, this is the required solution.