Question

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

Answer 1

Answer:

54 g

Explanation:

• The reaction between carbon and oxygen gas is given by the equation;

C(s) + O₂(g) → CO₂(g)

We are given;

18 g of Carbon

72 g of Carbon dioxide

• We need to calculate the amount of oxygen needed for the reaction.
• From the law of conservation of mass in chemical equation, the mass of the reactants is equal to the mass of the product.

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