Chemistry · Stoichiometry

Limestone is primarily composed of calcium carbonate (CaCO₃). When heated, it decomposes according to the reaction:

CaCO₃ --> CaO + CO₂

From the stoichiometric relationship, 100g of CaCO₃ decomposes to produce 44g of CO₂. Therefore, for 25g of CaCO₃, the amount of CO₂ produced is calculated as follows:

(25g CaCO₃ / 100g CaCO₃) * 44g CO₂ = 11g CO₂

Thus, the correct answer is 11g. Other options either overestimate or underestimate this calculated mass based on incorrect stoichiometric assumptions.

This option incorrectly assumes a different stoichiometric proportion.

This value is much higher than the possible mass of CO₂ produced, considering the initial mass of limestone.

Based on stoichiometry: 100g CaCO₃ produces 44g CO₂, hence 25g CaCO₃ produces 11g CO₂. This is the correct answer.

This value underestimates the mass of CO₂ produced from 25g of CaCO₃.

This value is close but slightly underestimates the correct stoichiometric calculation.