Answer:
6.67 moles
Explanation:
Given that:-
Moles of hydrogen gas produced = 10.0 moles
According the reaction shown below:-

3 moles of hydrogen gas are produced when 2 moles of aluminium undergoes reaction. 
Also, 
1 mole of hydrogen gas are produced when  moles of aluminium undergoes reaction.
 moles of aluminium undergoes reaction. 
So, 
10.0 moles of hydrogen gas are produced when  moles of aluminium undergoes reaction.
 moles of aluminium undergoes reaction. 
<u>Moles of Al needed  =  moles = 6.67 moles</u>
 moles = 6.67 moles</u>
 
        
             
        
        
        
The correct answer is 2.53 g of precipitate, BaCrO4.
        
             
        
        
        
Answer:
You will never know the exact volume with charles law
Explanation:
Doubling the temperature of gas doubles its volume, so long as the pressure and quantity of the gas are unchanged. 
  
        
                    
             
        
        
        
Answer:
H2O is a compound because its a main constitute of earths hydrosphere