Question

To determine the mass of CO2 that forms from a given mass of CaCO3, which of the following must be known? Check all that apply.

Answer 1

1 3 and 5

Step-by-step explanation:

Answer 2

To determine the mass of CO₂, the following must be known :

• the molar mass of CaCO₃
• the mole ratio of CaCO₃ to CO₂
• the molar mass of CO₂

Further explanation

Reaction

Decomposition of CaCO₃

CaCO₃ ⇒ CaO + CO₂

Given the mass of CaCO₃, so to determine the mass of CO₂ :

1. Find the mol of CaCO₃ from the molar mass of CaCO₃

`\tt n_(CaCO_3)=(mass~CaCO_3)/(MW~CaCO_3)`

2. Find the mole ratio of CaCO₃ : CO₂(from equation = 1 : 1)

`\tt n_(CaCO_3)/ n_(CO_2)=1/ 1`

3. Find the mass of CO₂ from the molar mass of CO₂

`\tt mass_(CO_2)=n_(CO_2)* MW_(CO_2)`