Predict whether the entropy change is positive or negative for each of the following reactions. a....

Predict whether the entropy change is positive or negative for each of the following reactions.

a. 2KClO4(s) --> 2KClO3(s)+O2(g)

b. H2O(g) --> H2O (l)

c. 2Na(s)+2H2O(l)-->2NaOH(aq)+H2(g)

d. N2(g)-->2N(g)

Solutions

Expert Solution

Entropy is a measure of disorder. So greater the number of degrees of freedom higher will be the entropy. So if a reaction proceeds in such a way the disorder/degrees of freedom increase then entropy will also increase.

a. Positive (KClO₄, a solid decomposes to gas and KClO₃. Number of particles increased from reactants to products and also O₂ is a gas. So the entropy will be higher in products. Hence entropy change is positive).

b. Negative (Gas has more degrees of freedom/disorder than liquid. So entropy decreases and change is negative)

c. Positive (Even though the number of products is less than the number of reactants, one of the products (H₂) is a gas which has more disorder. So effectively the disorder of prodcuts is high compared to that of reactants even though the number is less.)

d. Positive (Products has two gas atoms with very high degrees of freedom. So entropy change is positive)

queen_honey_blossom answered 1 year ago

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