Respuesta :
Remark
The balance numbers in front of the chemicals tell you how to set up the proportion to solve your question
For every 2 moles Na only 1 mole of Cl2 is required.
Equation
2 moles Na:1 mole Cl2 :: x moles Na:4 moles Cl2
Solution
2/1 = x/4 Cross multiply
2*4 = x*1
8 = x
Conclusion
8 moles of Na will be used. <<< Answer
The equation shows that for every mole of Cl2 that react, 2 moles of Na react too. You can find how many moles of sodium react like this:
4 moles Cl2 x (2 moles Na/ 1 mole Cl2) = 8 moles Na
8 moles of Sodium react
4 moles Cl2 x (2 moles Na/ 1 mole Cl2) = 8 moles Na
8 moles of Sodium react