It states that matter can neither be created nor destroyed.
This law was put forth by Antoine Lavoisier in 1789 . He performed rections for reaching to the above conclusion. This law formed the for several later developments in chemistry . Infact , this was the result of exact measurement of masses of reactants and products, and carefully planned experiments performed by Lavoisier
6.3 g of sodium bicarbonate is added to 15 g acetic acid solution .`CO_(2)` formed is allowed to escape. The weight of the solution left is 18 gram . What is the mass of `CO_(2)` formed.

Answer

To find the mass of carbon dioxide (CO₂) formed in the reaction between sodium bicarbonate and acetic acid, we can follow these steps:

### Step 1: Write the reaction equation
The reaction between sodium bicarbonate (NaHCO₃) and acetic acid (CH₃COOH) can be represented as follows:

\[ \text{NaHCO}_3 + \text{CH}_3\text{COOH} \rightarrow \text{CH}_3\text{COONa} + \text{H}_2\text{O} + \text{CO}_2 \]

### Step 2: Identify the masses given
- Mass of sodium bicarbonate (NaHCO₃) = 6.3 g
- Mass of acetic acid (CH₃COOH) = 15 g
- Mass of the solution left after CO₂ escapes = 18 g

### Step 3: Apply the law of conservation of mass
According to the law of conservation of mass, the total mass of the reactants must equal the total mass of the products. In this case, the mass of the products includes the mass of the solution left and the mass of CO₂ that escaped.

Let the mass of CO₂ formed be \( x \).

The equation can be set up as follows:

\[ \text{Mass of reactants} = \text{Mass of products} + \text{Mass of CO}_2 \]

Substituting the values:

\[ (6.3 \, \text{g} + 15 \, \text{g}) = 18 \, \text{g} + x \]

### Step 4: Solve for \( x \)
Now, we can simplify and solve for \( x \):

\[ 21.3 \, \text{g} = 18 \, \text{g} + x \]

Subtract 18 g from both sides:

\[ 21.3 \, \text{g} - 18 \, \text{g} = x \]

\[ x = 3.3 \, \text{g} \]

### Conclusion
The mass of CO₂ formed in the reaction is **3.3 g**.

---