Thermodynamics Question 99

Question: The equation 12H2+12Cl2HCl (ΔH298=22060kcal ) means

[CMC Vellore 1991]

Options:

A) The heat absorbed when one gram molecule of HCl is formed from its elements at 25oC is 22.060 kcal

B) The heat given out when one gram molecule of HCl is formed from its elements at 298 K is 22.060 kcal

C) The heat absorbed when one atom of hydrogen reacts with one atom of chlorine to form one molecule of HCl at 25oC and one atmospheric pressure is 22.060 kcal

D) The heat absorbed when one gram equivalent of HCl is formed from its elements at 298 K is 22.060 kcal

E) The intrinsic heat of one molecule of HCl is 22.060 kcal more than the intrinsic heats of one atom of hydrogen and one atom of chlorine

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Answer:

Correct Answer: B

Solution:

It means that the heat absorbed when one gram molecule of HCl is formed from its elements at 298K is =22.060kcal .



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