Which is the correct set of enthalpies of formation, in kJ/mol, for the given sp

Question

Which is the correct set of enthalpies of formation, in kJ/mol, for the given species? Hint: iodine is a solid at room temperature.

*** Give your reasoning

            I2(s)                   KI(s)                 I2(g)

A)        -328                 0                      +62
B)        -328                 +62                  0
C)        +62                  -328                 0
D)        +62                  0                      -328
E)         0                      -328                 +62
F)         0                      +62                  -328

*** The answer is E. but PLEASE PLEASE SHOW ALL OF YOUR WORK CLEARLY on how you get that answer so I can understand it!! THANK YOU!!

Explanation / Answer

any compound in its standard state at room temperature will have enthalphy 0 . Examples ( dH of O2(g) is 0 , dH of Na(s) is 0)

Iodine standard state is I2 solid , hence enthalphy for I2 (s) is 0

to convert solid iodine to gas iodine we need to supply heat , hence I2(g) will be +ve value since I2(g) gas formation is based on absorbtionof heat ( heat absorbed meabs +ve sign).

Basedon these two factors answer is option E

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