The standard enthalpies of formation of various iodine species are as follows: Substance ΔH°f (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)

its first and third is your answer i did the qustion the fourth isnt right

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.