Question

Calcium carbonate decomposes to calcium oxide in a kiln in the following reaction CaCO3 CaO + CO2 Calculate the mass of calcium oxide that can be produced when 300 tonnes of calcium carbonate is heated.

Answer 1

Answer: The mass of calcium oxide is 168 tonnes .

Explanation:

Balanced chemical equation is :$CaCO3$ → $CaO+CO2$

Molar mass of calcium carbonate($CaCO_{3}$) $=40+12+(16$×$3)$$=100 g = 0.1 kg$

Molar mass of calcium oxide $(CaO) = 40+16 = 56g =0.056 kg$

According to the balanced chemical reaction, 1 mole of $CaCO_{3}$ produces 1 mole of $CaO$

Number of moles of calcium carbonate when 300 tonnes$(300000kg)$ is heated

                                          $= \frac{300000}{0.1} =3000000$

That is the number of moles of calcium oxide is $3000000$

∴ the mass of calcium oxide$= 3000000$×$0.056 = 168000 kg = 168 tonnes$