When Na + O2 --> Na2O is balanced, what coefficient is in front of the Na?

Hey there!

Na + O₂ → Na₂O

Balance O.

2 on the left, 1 on the right. Add a coefficient of 2 in front of Na₂O.

Na + O₂ → 2Na₂O

Balance Na.

1 on the left, 4 on the right. Add a coefficient of 4 in front of Na.

4Na + O₂ → 2Na₂O

Our final balanced equation: 4Na + O₂ → 2Na₂O

Hope this helps!

answer; i believe the correct answer is (solid gold);

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)