Question

Sodium (Na) reacts with chlorine gas (Cl2

) to form sodium chloride (NaCl) as shown in the
equation:
2Na + Cl2 → 2NaCl
If 4 moles of chlorine gas react, how many moles of sodium will react?

Answer 1

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

Answer 2

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