Question

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 13.2g of carbon were burned in the presence of 46,0g of oxygen, 10.8g of oxygen remained unreacted. What mass of carbon dioxide was produced?

Answer 1

The reaction is as follows,

C + O2 ---> CO2

According to the stoichiometry of the reaction 1 mole of C reacts with 1 mole of O2 to produce 1 mole of CO2

Given,

Mass of C = 13.2 g

Mass of O2 = 46 g

Mass of O2 unreacted = 10.8 g

=> Mass of O2 reacted = 46 -10.8 = 35.2 g

We know that,

Atomic Mass of C = 12 g / mol

Molar Mass of O2 = 32 g / mol

=> Moles of C =13.2 / 12 = 1.1 mol

Moles of O2 that reacted = 35.2 / 32 = 1.1 mol

Therefore,

According to the stoichiometry of the reaction 1.1 mole of C reacts with 1.1 mole of O2 to produce 1.1 mole of CO2

=> Moles of CO2 produced = 1.1

Molar Mass of CO2 = 44 g / mol

=> Mass of CO2 produced = 1.1 x 44 = 48.4 g