24. Let's determine the amount of substance of the released gas

According to the chemical reaction equation:

$$
\mathrm{n}\left(\mathrm{CO}_{2}\right)=\mathrm{n}\left(\mathrm{CaCO}_{3}\right)=2.4 \text { mol }
$$

Determination of the amount of substance - 2 points

25. Let's calculate the volume of the released gas

$$
V\left(\mathrm{CO}_{2}\right)=n \cdot V m=2.4 \cdot 22.4=53.76 \text { L }
$$

Determination of the volume of the substance - 2 points
Answer: 53.76 liters

TOTAL 10 points

## TASK № 2

Potassium chloride was treated with concentrated sulfuric acid, and the resulting salt was added to a solution of potassium hydroxide. Barium nitrate solution was added to the resulting solution. The precipitate formed was filtered, mixed with carbon, and calcined. Write the equations for the four reactions described.

## Solution: