Chemical Thermodynamics Question 374

Question: The species which by definition has zero standard molar enthalpy of formation at $ 298K $ is

Options:

A) $ Br_2(g) $

B) $ Cl_2(g) $

C) $ H_2O( g ) $

D) $ CH_4(g) $

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Answer:

Correct Answer: B

Solution:

  • The species in its elemental form has zero standard molar enthalpy of formation at 298 K. At 298K, $ Cl_2 $ is gas while $ Br{ _2} $ is liquid.


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