One more of a mixture of `Li_(2)CO_(3)` and `Na_(2)CO_(3)` forms 0.75 mol of `CO_(2)` at NTP: What is percentage of each in the mixture? "

Explanation

To solve the problem, we need to determine the percentage composition of lithium carbonate (Li₂CO₃) and sodium carbonate (Na₂CO₃) in a mixture that produces 0.75 moles of carbon dioxide (CO₂) upon heating.

### Step-by-Step Solution:

1. **Understand the Reaction**:
When lithium carbonate (Li₂CO₃) is heated, it decomposes to form lithium oxide (Li₂O) and carbon dioxide (CO₂):
\[
\text{Li}_2\text{CO}_3 \rightarrow \text{Li}_2\text{O} + \text{CO}_2
...