Answer:
43.7
Explanation:
mole is equal mass concentration/ moler mass of MgCl²
 
        
             
        
        
        
Volume percent = Volume of solute
                              ----------------------------------
                                Volume of the solution
  
                  2                    Volume of the solute
               -------   =           ------------------------------
                100                               250
                     
         Volume of the solute = 2 x 250
                                                ------------
                                                  100         
                                             =   5 mL.
Hope this helps!
                            
        
             
        
        
        
Answer: D. They show that neither theory is complete and entirely correct.
Explanation:
Theory is the set of rules and principles that describe and explain a particular phenomenon (the existence of the moon in this case) and is subject to changes as new evidence emerges that gives meaning to it. 
In this sense, there are many theories about the Earth's moon formation and two of the "accepted" theories are described before the question. In addition, both theories explain in a certain way the reason why the Moon is predominantly composed of elements similar to those found on Earth.
However, both theories seem to be incomplete when trying to explain our Moon's origin.
 
        
                    
             
        
        
        
Answer:
C
Explanation:
Large chlorine atoms can not fit within the atoms of boron
 
        
             
        
        
        
What term and what definition..