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Question

The standard enthalpies of formation of various iodine species are as follows:

SubstanceHºf(kJ/mol)
I(g)+107
I2(g)+21
HI(g)+26

What additional information is needed to calculate the standard enthalpy change of the following reaction?
H2(g) + I2(g) → 2HI(g)
A) none, because the answer is 2 times 26 kJ/mol
B) the enthalpy of formation of I-(g) and H+(g)
C) the enthalpy of formation of solid iodine
D) none, because the enthalpy of formation of I2(g) and HI(g) are given and the enthalpy of elemental hydrogen is zero
E) the enthalpy of formation of gaseous hydrogen

Answer

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