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Which one of the following quantities is generally not obtainable from a single heating or cooling curve of a substance, measured at atmospheric pressure?
A. melting point
B. boiling point
C. triple point
D. heat of fusion
E. heat of vaporization

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Answer:

C. triple point  

Explanation:

It is rare for a substance to have a triple point at 1 atm, so you can't measure it if you are limited to 1 atm.

It's easy to measure the melting point and boiling point, because they are the horizontal portions of the curve.

If you are adding heat at a constant rate, you can determine the heats of fusion and vaporization by measuring the times it takes for the substance to completely melt or vaporize.

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Tundexi

A triple point are the quantities that are not obtainable from a single heating or cooling curve of a substance that is measured at atmospheric pressure.

Generally, it is rare for a substance to have a triple point at 1 atm, so, we can not measure it if you are limited to 1 atm.

However, it is very easy to measure the melting point and boiling point because they are the horizontal portions of the curve.

In conclusion, the Option C is correct because the answer is triple point.

Read more about atmospheric pressure

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