Given: 4na + o2 → 2na2o in this chemical reaction, how many moles of na2o will be produced if 2.90 moles of na react completely? express your answer to three significant figures.

Since we already have the balanced equation, we know that the ratio between is respectively.

So then we can set up a proportion to find the number of moles produced when 2.90 moles of Na react completely:

Then we cross multiply and solve for x:

Therefore, we know that when 2.90 moles of Na react completely, there are 1.45 moles of that are produced.