Question

In which of the following processes would one expect ΔS to have the largest value ?...

In which of the following processes would one expect ΔS to have the largest value ?

a. 2NO(g) + O2 (g) → 2NO2 (g)

b. C2H4 (g) + HBr(g) → C2H5Br(g)

c. CO(g) + 1/2O2 (g) → CO2 (g)

d. H2 (g) + F2 (g) → 2HF(g)

e. CH2CHOH (g) + 5/2O2 (g) → 2CO2 (g) + 2H2O(g)

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Homework Answers

Answer #1

Change in gaseous mole(dN) = moles of gaseous product- moles of gaseous reactant

In reaction a. dN = 2 -(2+1) = -1

In reaction b. dN = 1- (1+1) = -1

In reaction c. dN = 1-(1+ 1/2) = -1/2

In reaction d. dN = 2-(1+1) = 0

In reaction e. dN = (2+2) - (1+ 5/2) = 1/2

dN is positive only in reaction e. Means gaseous molecule are increasing in this reaction so randomness will increase and dS will also largest for this.

Correct option is e.

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