Without using Appendix B, predict the sign of ΔS° for(b) KBr(s)→ KBr(aq)

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23-08-2022
Chemistry

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Without using Appendix B, predict the sign of ΔS° for(b) KBr(s)→ KBr(aq)

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tripatsingh039 tripatsingh039 · Answer 1 · 2022-08-28T14:19:49+02:00

Since the sign is positive, the entropy increased by 88.48 J/K.

Examine the phases of the species present to determine whether a physical or chemical process will cause an increase or decrease in entropy. Keep in mind "Silly Little Goats" to aid you in telling.

[1 Sf K+1 + 1 Sf Br-1 (aq)] ([1Sf(KBr (s))])

[1(102.5) + 1(82.42)] - [1(96.44)] = 88.48 J/K

If the entropy has grown, we say that Delta S is positive, and if it has dropped, we say that Delta S is negative. Due to its ionic nature, KBr is soluble in water and causes the 'K(+)' ions to hydrate.

Learn more about Entropy here-

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