In the reaction c + o2 co2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. what mass of oxygen
would be needed in the reaction?
18 g
549
729
90g

54 g

C(s) + O₂(g) → CO₂(g)

We are given;

18 g of Carbon

72 g of Carbon dioxide

Therefore;

Mass of Oxygen gas + mass of the carbon = Mass of carbon dioxide

Therefore;

Mass of Oxygen gas = mass of carbon dioxide - mass of carbon

                                  = 72 g - 18 g

                                  = 54 g

Therefore, the mass of Oxygen needed would be 54 g

the answer is 75.0%.