Oxygen oxidizes ethyne to carbon dioxide and water as shown by the equation :
`2C_2H_2 +5O_2 rarr 4CO_2 + 2H_2O`
What volume of ethyne gas at S.T.P. is required to produce 8.4 `dm^3` of carbon dioxide at S.T.P. ? [H= 1, C = 12, O = 16]

Explanation

To solve the problem, we need to determine the volume of ethyne (C₂H₂) gas required to produce 8.4 dm³ of carbon dioxide (CO₂) at standard temperature and pressure (S.T.P.).

### Step-by-Step Solution:

1. **Understand the Reaction**:
The balanced chemical equation is:
\[
2C_2H_2 + 5O_2 \rightarrow 4CO_2 + 2H_2O
...