The outer core of the Earth is a fluid layer about 2,300 km (1,400 mi) thick and composed of mostly iron<span> and</span>nickel<span> that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface.</span>
        
             
        
        
        
Answer:
for one mole of C2H6 there are 7/2 mole of O2 required. so for4. 50 moles you require 4.50 x 7/2 = 15.75 moles of O2.
Explanation:
i hope it's helpful
 
        
             
        
        
        
Molarity = moles of solution/ liter of solution 
4.32x10^2/20
432/20=
21.6 M
        
                    
             
        
        
        
I think it enters a new  material