Question

Rank each of the following groups of molecules from least entropy to most entropy.

a. Fe₂O₃ (s) ; Al₂O₃ (s); Fe₃O₄ (s)

b. ClO₄- (aq) ; ClO₂- (aq); ClO₃-

c. SF₆ (g) ; SF₄ (g) ; S₂F₁₀ (g)

d. Mg (s) ; Ba (s) ; Ca (s)

Answer 1

a)

least to most entropy : Al₂O₃ (s) < Fe₂O₃ (s) < Fe₃O₄ (s)

b)

least to most entropy   : ClO₂- (aq) < ClO₃- < ClO₄- (aq)

C)

least to most entropy : SF₄ (g) < SF₆ (g) < S₂F₁₀ (g)

d)

least to most entropy : Mg(s) < Ca(s) < Ba(s)

explanation : the reasons for all parts is only one thing . molar mass increases entropy increases.

more molar mass compound will have more entropy . less molar mass has lesser entropy

so more molar mass compound will have greater disorder .