Answer
The partial pressure of the nitrogen in the mixture is equal to 425 torr.
Work Step by Step
1. Identify the equation that we will use to solve this problem.
- The sum of the partial pressures.
$P_{total} = P_1 + P_2 + P_3 + ...$
- For this mixture:
$P_{total} = P_{O_2} + P_{N_2} + P_{He}$
2. Solve for $P_{N_2}$:
$P_{total} - P_{O_2} - P_{He} = P_{N_2}$
3. Substitute the given values into the equation:
$925 \space torr - 425 \space torr - 75 \space torr = P_{N_2}$
$P_{N_2} = 425 \space torr$
