To find the pressure of the other gas in the container, we can use Dalton's Law of Partial Pressures. According to this law, the total pressure in a container is equal to the sum of the partial pressures of the individual gases.
Given:
- Pressure of the first gas (P1) = 80.0 mmHg
- Total pressure (P_total) = 120.0 mmHg
We can find the pressure of the second gas (P2) using the equation:
\[ P_{total} = P_1 + P_2 \]
Rearranging the equation to solve for \( P_2 \):
\[ P_2 = P_{total} - P_1 \]
Substituting the given values:
\[ P_2 = 120.0 , \text{mmHg} - 80.0 , \text{mmHg} \]
\[ P_2 = 40.0 , \text{mmHg} \]
Thus, the pressure of the other gas in the container is \( \textbf{40.0 mmHg} \).
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