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If 500 mL of gas A at 400 torr and 666.6 mL of B at 600 torr are placed in a 3 litre flask, the pressure of the system will be

1. 200 torr
2. 100 torr
3. 50 torr
4. 366 torr

Correct answer: 366 torr

Solution

Using Dalton's Law of Partial Pressures, calculate the partial pressures of gases A and B in the 3 L flask. For gas A: P = (400 torr × 0.5 L) / 3 L = 66.67 torr. For gas B: P = (600 torr × 0.6666 L) / 3 L = 133.33 torr. Total pressure = 66.67 + 133.33 = 200 torr.

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