Thermodynamics Question 99
Question: The equation $ \frac{1}{2}H _{2}+\frac{1}{2}Cl _{2}\to HCl $ ($ \Delta H _{298}=-22060kcal $ ) means
[CMC Vellore 1991]
Options:
A) The heat absorbed when one gram molecule of $ HCl $ is formed from its elements at $ 25^{o}C $ 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 $ 25^{o}C $ 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 $ .
