Predict which of the following reaction(s) has a positive entropy change? I. Ag+(aq) + Cl-(aq)→ AgCl(s) II. NH4Cl(s)→ NH3(g)+ HCl(g) III. 2NH3(g)→ N2(g)+3H2(g)

Question

Predict which of the following reaction(s) has a positive entropy change? I. Ag+(aq) + Cl-(aq)→ AgCl(s) II. NH4Cl(s)→ NH3(g)+ HCl(g) III. 2NH3(g)→ N2(g)+3H2(g) (A) I and II (B) III (C) II and III (D) II

Tardigrade Admin · Accepted Answer

We know that Δ S text reaction 0= Sigma Δ S 0 Product - Sigma Δ S 0 Reactant When we compare standard molar entropies for substance, we will find that standard molar entropy of Gas is grater than Liquids and Liquid's standard molar entropy is grater than Solids. Using these information it is clear that reaction 2 and 3 has positive entropy change.

Q. Predict which of the following reaction(s) has a positive entropy change?
$I . A g^{+} (a q) + C l^{-} (a q) \to A g Cl (s)$
$II . N H_{4} Cl (s) \to N H_{3} (g) + H Cl (g)$
$III .2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$

$I$ and $II$

$III$

$II$ and $III$

$II$

Q. Predict which of the following reaction(s) has a positive entropy change? I.Ag+(aq)+Cl−(aq)→AgCl(s) II.NH4​Cl(s)→NH3​(g)+HCl(g) III.2NH3​(g)→N2​(g)+3H2​(g)

I and II

III

II and III

II

Q. Predict which of the following reaction(s) has a positive entropy change?
$I . A g^{+} (a q) + C l^{-} (a q) \to A g Cl (s)$
$II . N H_{4} Cl (s) \to N H_{3} (g) + H Cl (g)$
$III .2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$

$I$ and $II$

$III$

$II$ and $III$

$II$