Formic acid, HCHO2, burns in oxygen to form carbon dioxide and water as follows:
HCHO2 (aq) + O2 (g) → 2 CO2 (g) + 2 H2O (l).
If a 3.15-g sample of formic acid was burned in 2.86 g of oxygen, what mass of carbon dioxide
would be produced?

What is the limiting reagent?