Chemical Kinetics and Nuclear ChemistryHard
Question
In gaseous reactions important for the understanding of the upper atmosphere H2O and O react bimolecularly to form two OH radicals. ᐃH for this reaction is 72 kJ at 500 K and Ea is 77 kJ mol-1, then Ea for the bimolecular recombination of two OH radicals to form H2O and O is :
Options
A.3 kJ mol-1
B.4 kJ mol-1
C.5 kJ mol-1
D.7 kJ mol-1
Solution
H2O + O → 2OH → ᐃH = 72 kg/mole
and Ea = 77 Kg/mole
Then we know ᐃH = Ea - Eb
72 = 77 - Eb
Eb = 5 KJ/mole
and Ea = 77 Kg/mole
Then we know ᐃH = Ea - Eb
72 = 77 - Eb
Eb = 5 KJ/mole
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