A mixture of hydrogen and chlorine remains unreacted until it is exposed to ultraviolet light from a burning magnesium strip. Then the following reaction occurs very rapidly:
H2 + Cl2 → 2 HCl ΔG = - 45.54 kJ
ΔH = - 44.12 kJ
ΔS = - 4.76 J/k
Select the statement below which BEST explains this behavior.
A. The reactants are thermodynamically more stable than the products.
B. The reaction has a small equilibrium constant.
C. The ultraviolet light raises the temperature of the system and makes the reaction more favorable.
D. The negative value for ΔS slows down the reaction.
E. The reaction is spontaneous by thermodynamics, but the reactants are kinetically stable.
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