Question & Answer: Gaseous dinitrogen pentoxide decomposes to produce oxygen gas and nitrogen dioxide gas…..

Gaseous dinitrogen pentoxide decomposes to produce oxygen gas and nitrogen dioxide gas. Predict whether the entropy will increase or decrease for this reaction.

Expert Answer

Answer

N2O5 (g)————–> 2NO2(g) + 1/2O2(g)

DeltaSrex = Sf products – Sf reactants

= 1/2*205.2 + 2*240 -346.6

= 236J/mole-K

it is spontaneous reaction.

N2O5 decomposes to gives 2 moles of NO2 and O2

so no of particles are increases. The entropy value is increases.

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