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

54 g

Step-by-step 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