Chemical Kinetics-1

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Q : 2 H2 + O2 â†’ 2 H2O
This reaction is exothermic in the forward direction:
2 H2 + O2 â†’ 2 H2O + 285 kJ
but endothermic in the reverse direction:
2 H2O + 285 kJ â†’ 2 H2 + O2
Consider a general reversible reaction such as:
A + B â†’ C + D
Given the following potential energy diagram for this reaction, determine Î”H and Ea for
both the forward and reverse directions. Is the forward reaction endothermic or exothermic?

#Chemistry #Physical Chemistry

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2 Answers

106

Asish Mahapatra ·2009-12-21 21:32:25

Forward reaction:
Î”H = -20 kJ
Ea = 60 kJ
exothermic

Reverse reaction:
Î”H = +20 kJ
Ea = 80 kJ
endothermic

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1

abcd ·2009-12-21 21:51:11

i agree with ashish's answer...hes bang on target

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