It’s a or b i think it’s b
        
             
        
        
        
Answer:
Va = (MbVb)/Ma
Explanation:
Divide both sides by Ma and voila!
 
        
             
        
        
        
Isn't it nitrogen AND chlorine? Both are nonmetals, and they need to gain electrons in order to bond.
        
                    
             
        
        
        
Yes, you're right the answer is 0,02 moles.
        
             
        
        
        
Whether water is frozen, in a gaseous state, or is a liquid, it is still H2O. So the chemical composition does stay the same.