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## Homework Statement

http://icho2013.chem.msu.ru/materials/IChO-2013_Theoretical_Official_English_Version.pdf

Looking at problem 1.

## Homework Equations

The integrated form of the Clausius-Clapeyron equation:

[tex]ln(\frac{P_{T2}}{P_{T1}}) = -\frac{\Delta H}{R} \cdot (\frac{1}{T_2} - \frac{1}{T_1})[/tex]

## The Attempt at a Solution

Part 1 is irrelevant, do not need to read. Part 2 is fine, Part 3 is fine. For Part 4, once you correctly guess the temperature, it's ok, because we rely on the same reaction as before, decomposition of methane hydrate into ice, and looking for minimum temperature at which it will not occur; we can use either of the 2 possible P,T sets (one given, one ascertained from Part 3) to calculate the P for Part 4.

However, Part 5 causes trouble because only using one of the 3 P,T sets of data we have now can we find the correct T from the P in Part 5; the other two give wrong readings. Why is this, and how should I tell which sets of P,T data can be used for future P, T calculations from the situation and which cannot?