Which sample of water has the lowest vapor pressure?
1.
100 mL at 50°C
2.
200 mL at 30°C
3.
300 mL at 40°C
4.
400 mL at 20°C

400 ml at 20⁰C

Explanation:

VP ∝ Temp => Increasing temperature increases VP or decreasing temperature decreases VP. VP is independent of the quantity of liquid in consideration. Therefore, the sample at the lower temperature would have the lowest VP; i.e., 400-ml at 20⁰C.

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