The enthalpy changes for the following processes are listed below:
Cl2(g) = 2Cl(g) , 242.3kJ mol–1
I2(g) = 2I(g) , 151.0kJ mol–1
ICl(g) = I(g) + Cl(g) , 211.3kJ mol–1
I2(s) = I2(g) , 62.76kJ mol–1
Given that the standard states for iodine and chlorine
are I2(s) and Cl2(g) , the standard enthalpy of formation
for ICl(g) is
(a) –14.6kJ mol–1
(b) –16.8kJ mol–1
(c) +16.8kJ mol–1
(d) +244.8kJ mol–1.
