LiOH has been used by astronauts. Explain the use with the help of reaction.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Context**: Lithium hydroxide (LiOH) is used by astronauts in space missions. The primary reason for its use is its ability to absorb carbon dioxide (CO2) from the air.

2. **Chemical Reaction**: When lithium hydroxide reacts with carbon dioxide, it forms lithium carbonate (Li2CO3) and water (H2O). The balanced chemical reaction is:
\[ 2 \text{LiOH} + \text{CO}_2 \rightarrow \text{Li}_2\text{CO}_3 + \text{H}_2\text{O} \]
...