Answer:  Aluminum reacts with oxygen to produce aluminum oxide as follows: 4Al + 3O2 → 2Al2O3 a.
Explanation: I really really <u>hope</u> that was <u>helpful.</u>
 
        
             
        
        
        
Answer:
The answer to your question is 1 M
Explanation:
Data
Molarity = ?
mass of CaCl₂ = 222.2 g
Volume = 2 l
Process
1.- Calculate the molar mass of CaCl₂
CaCl₂ = 40 + (35.5 x 2) = 40 + 71 = 111 g
2.- Calculate the moles of CaCl₂
                     111g of CaCl₂ ---------------- 1 mol 
               222.2 f of CaCl₂  ----------------  x
                       x = (222.2 x 1) / 111
                       x = 222.2 / 111
                       x = 2 moles
3.- Calculate the Molarity
Molarity = moles / Volume
-Substitution
Molarity = 2/2
-Result 
Molarity = 1 
 
        
             
        
        
        
Answer:
There are 6.022x10^23 molecules
 
        
             
        
        
        
Answer:
6 moles of oxygen, or 3O2.
Explanation:
I would build a proportion for this:

 
        
             
        
        
        
The number is 25. The square root of 25 is 5 and 5x2 is 10 and then 10+5 is 15