Thermodynamics and Thermochemistry 1 Question 9
9. For a diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantities? (a)
(c)
(b)
(d)
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Solution:
- For diatomic ideal gases,
where,
The explanation of various plots are as follows.
(a) We know that,
(b) In this plot,
(c) For ideal gases, Internal energy
Thus, as temperature increases internal energy also increases. As temperature increases further degree of freedom also increases thus, there is slight variation in the graph. First translational degree of freedom is present followed by rotational and vibrational degree of freedom. Hence, plot given in option (c) is also correct.
(d)
