What volume of fluorine reacts if 12 liters of oxygen are produced in the reaction Al2O3 + F2 yields O2 + AlF3

Question

I need these answers so I can pass the class you got me?

 

Answer 1

One really needs to know the temperature and pressure.  If not given, and you assume STP, then Sydney G's answer is quite appropriate.  However, you can do this another way, without converting to moles, because at STP liters can be used.  So, in the correctly balanced equation, 6 liters of fluorine will produce 3 liters of oxygen, therefore 12 liters of oxygen will require 24 liters of fluorine.  The balanced equation is 

2Al₂O₃ + 6F₂ ==> 4AlF₃ + 3O₂

 

Answer 2

1. Convert liters of oxygen to moles of oxygen using the conversion factor for gases (1 mole=22.4 L)

2. Balance the chemical equation!

3. Use coefficients (mole ratio) to find out how many moles of fluorine reacts

4. Convert moles fluorine to liters!

 

Hope this helps!