Question

Does entropy increase, decrease, or stay the same in the following reactions, and why? a) N2...

Does entropy increase, decrease, or stay the same in the following reactions, and why?

a) N2 + 3 H2 2NH3

b) Urea + H2O CO2 + 2 NH3

c) ADP + Pi ATP

d) Enzyme + Reactant Enzyme + Product

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Homework Answers

Answer #1

Entropy of the reaction depends on the delta n value ( change in nom of mols of product - reactants )

delta n = total mols of products - total mols of reactants

If delta n = + ve entropy increses ( less Num of molecules giving more nom of molecules upon a reaction)

-ve then entropy decreases ( more Num of molecules giving less nom of molecules upon a reaction)

1) N2 + 3 H2 ........> 2 NH3 ( all in gas phase)

Delta n = 2-4 = -2 entropy decreases

2) urea (s) + H2O ........> CO2 + 2 NH3

Delta n= 3-1 = 2 entropy increases

3) ADP + pi ..........> ATP

Delta n = 1-2 = -1 entropy decreases

4) enzyme + reactant ........> enzyme+ product,

Delta n = 0 no increase no decrease, stay the same

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