Answer :
To determine the type of solute in the solution, we need to understand how the solubility of the solute changes with temperature, based on the data provided in the table:
```
\begin{tabular}{|c|c|}
\hline Temp [tex]$\left({ }^{\circ} C \right)$[/tex] & \begin{tabular}{c}
Concentration \\
[tex]$\left(\frac{ g \text { solute }}{ mL \text { solvent }}\right)$[/tex]
\end{tabular} \\
\hline 18.5 & 1.43 \\
\hline 37.9 & 0.81 \\
\hline 59.3 & 0.30 \\
\hline 80.1 & 0.21 \\
\hline
\end{tabular}
```
Let's break down the results:
1. Understanding Concentration Change:
- At 18.5°C, the concentration is 1.43 g/mL.
- At 37.9°C, the concentration decreases to 0.81 g/mL.
- At 59.3°C, the concentration further decreases to 0.30 g/mL.
- At 80.1°C, the concentration decreases again to 0.21 g/mL.
2. Trend Observation:
- We observe that as the temperature increases, the concentration of the solute in the solvent decreases.
3. Conclusion on Solute Type:
- Typically, gases are more soluble at lower temperatures and less soluble at higher temperatures. Conversely, solids often become more soluble with increasing temperature.
- Since the concentration of the solute decreases with increasing temperature, this matches the behavior of gases.
Therefore, the solute is a GAS because the amount dissolved DECREASES as temperature increases.
```
\begin{tabular}{|c|c|}
\hline Temp [tex]$\left({ }^{\circ} C \right)$[/tex] & \begin{tabular}{c}
Concentration \\
[tex]$\left(\frac{ g \text { solute }}{ mL \text { solvent }}\right)$[/tex]
\end{tabular} \\
\hline 18.5 & 1.43 \\
\hline 37.9 & 0.81 \\
\hline 59.3 & 0.30 \\
\hline 80.1 & 0.21 \\
\hline
\end{tabular}
```
Let's break down the results:
1. Understanding Concentration Change:
- At 18.5°C, the concentration is 1.43 g/mL.
- At 37.9°C, the concentration decreases to 0.81 g/mL.
- At 59.3°C, the concentration further decreases to 0.30 g/mL.
- At 80.1°C, the concentration decreases again to 0.21 g/mL.
2. Trend Observation:
- We observe that as the temperature increases, the concentration of the solute in the solvent decreases.
3. Conclusion on Solute Type:
- Typically, gases are more soluble at lower temperatures and less soluble at higher temperatures. Conversely, solids often become more soluble with increasing temperature.
- Since the concentration of the solute decreases with increasing temperature, this matches the behavior of gases.
Therefore, the solute is a GAS because the amount dissolved DECREASES as temperature increases.
