Question

When heated, calcium carbonate decomposes according to the equation given below:

CaCO3 --> CaO + CO2
If 3.0 moles of CaCO3 are decomposed, how many grams of CO2 will be produced?


44.0 g
88.0 g
132 g
3.00 g

Answer 1

132g

Step-by-step explanation:

The reaction equation is given as:

CaCO₃ → CaO + CO₂

Given;

Number of moles of CaCO₃ = 3 moles

Unknown:

Mass of CO₂ produced = ?

Solution:

From the balanced reaction equation;

1 mole of CaCO₃ will produce 1 mole of CO₂;

3 mole of CaCO₃ will then produce 3 moles of CO₂

To find the mass of CO₂;

Mass of CO₂ = number of moles x molar mass

Molar mass of CO₂ = 12 + 2(16) = 44g/mol

Mass of CO₂ = 3 x 44 = 132g