Question

Study the balanced equation.

C + O2 → CO2
(M O2 = 32 g/mol; M CO2 = 44 g/mol)

When 78.0 g of carbon dioxide (CO2) are produced, what mass of oxygen is present in the product?

56.7 g oxygen
35.0 g oxygen
52.3 g oxygen
28.4 g oxygen

I do not believe it is 52.3 or 35, I believe it is 56.7 please feel free to give me input i need help

Answer 1

molecules (mols) CO2 / molecules (mols) O2 = 1 from balanced eqn
78 g * 1 mol/44 g = 1. 772 mols of both CO2 and also O2
so how much mass is 1.772 mols of O2
1.772 mols * 32 g/mol = 56.7 grams of O2