I think the answer would b C
        
             
        
        
        
Answer: a pair of antennae 
Explanation:
 
        
             
        
        
        
The concentration of Ca2+ ions is half that of the Cl- ions.
        
                    
             
        
        
        
Answer:yes
Explanation:it doesnt know
 
        
             
        
        
        
Hey there!
Molar mass NaCl = 58.44 g/mol
Number of moles 
n =  mass of solute / molar mass
n = 59.76 / 58.44
n = 1.0225 moles of NaCl
Volume in liters:
270 mL / 1000 => 0.27 L
Therefore:
M = number of moles / volume ( L )
M = 1.0225 / 0.27
= 3.78 M
Hope that helps!