Question

Sodium (Na) reacts with chlorine gas (Cl2

Answer 1

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

Answer 2

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