Arrange the following reaction equations according to increasing Delta S_rxn deg

Question

Arrange the following reaction equations according to increasing Delta S_rxn degree values (do not consulting references): S(s) + O_2(g) rightarrow SO_2(g) H_2(g) + O_2(g) rightarrow H_2O_2(l) CO(g) + 3H_2(g) rightarrow CH_4(g) + H_2O(g) C(s) + H_2O(g) rightarrow CO(g) + H_2(g) Use the data in Appendix D to calculate the value of Delta S_rxn degree of the following reaction equations at 25 degree C 4NH_3(g) + 7O_2(g) rightarrow 4NO_2(g) + 6H_2O(g) CO(g) + 2H_2(g) rightarrow CH_3OH(l) C(s, graphite) + H_2O(g) rightarrow CO(g) + H_2(g) 2CO(g) + O_2(g) rightarrow 2CO_2(g) Naphthalene, the active component of one variety of mothballs, sublimes at room temperature. If the process described by the equation naphthalene(s) rightarrow naphthalene(g) spontaneous? What are the signs of Delta G_rxn, Delta H_rxn, and Delta S_rxn at 25 degree C and one bar? What drives the reaction?

Explanation / Answer

Entropy is a measure of degree of randomness or disorderness present in system for example gases have higher entropy then liquids and solids.

In a reaction if products have higher moles of gases then entropy increase and if reactants have higher moles of gas then entropy decrease during reaction.

For given reactions increasing order of entropy change is :-

B<C<A<D

For reactions B and C the entropy decrease i.e Srx is -be( more negative for B)

For reaction A entropy change is zero. For reaction D entropy change is positive.

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