I'm assuming that by "miles" you mean moles.
If O2 is the excess reactant, that means Fe is the limiting reactant. That means that the amount of product being formed depends on the amount of Fe reactant present. To calculate the moles of Fe2O3 formed, start with the given 6.4 moles of Fe and use the mole to mole ratio given by the reaction as shown below:
6.4 mol Fe x 

 = 
3.2 mol Fe2O3
 
        
        
        
Answer:
 X represents oxygen and Y represents carbon dioxide. 
Explanation:
 
Because in respiration, you consume oxygen and make carbon dioxide whereas, in photosynthesis, the equation is reversed and you use carbon dioxide and make oxygen and glucose.
 
        
             
        
        
        
<span>Sulfuric acid has the highest production levels of any chemical in both the US and the world. The US alone creates 37 million tons a year. It has many uses, but one of the largest is as fertilizer.</span>
        
             
        
        
        
Answer:
145.8g
Explanation:
Given parameters: 
Number of moles of magnesium hydroxide  = 2.5mol 
Unknown: 
Mass of Mg(OH)₂  = ? 
Solution: 
To solve this problem we use the expression below; 
   Mass of Mg(OH)₂ = number of moles x molar mass 
  Molar mass of Mg(OH)₂ = 24.3 + 2(16 + 1)  = 58.3g/mol 
  Mass of Mg(OH)₂ = 2.5 x 58.3  = 145.8g