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

Answer:

1 3 and 5

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

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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

$\tt n_{CaCO_3}=\dfrac{mass~CaCO_3}{MW~CaCO_3}$

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

$\tt n_{CaCO_3}\div n_{CO_2}=1\div 1$

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

$\tt mass_{CO_2}=n_{CO_2}\times MW_{CO_2}$