Final answer:
The vapour pressure curve of a substance with a normal boiling point of 30°C would be found at atmospheric pressure of 1 atm.
Step-by-step explanation:
If a substance has a normal boiling point of 30°C, the vapour pressure curve for that substance would be found at atmospheric pressure of 1 atm. The vapour pressure curve shows the relationship between temperature and vapour pressure at a given pressure. At the normal boiling point, the vapour pressure is equal to the atmospheric pressure, and as the temperature increases above the normal boiling point, the vapour pressure also increases.
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