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Which of the following statements about critical temperature is correct?

AGases with stronger intermolecular forces have higher critical temperatures
BGases with weaker intermolecular forces have higher critical temperatures
CCritical temperature is the same for all gases
DCritical temperature is always below $100 K$

Answer: A

T_{c} = 8 a /27 R b

increases with

a

, the measure of attraction. Strongly attracting gases such as

NH X_{3}

(

405 K

) or

SO X_{2}

(

430 K

) have high

T_{c}

, while

He

has

T_{c} = 5 K

.

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