Which one of the following has Δ S° greater than zero?

Question

Which one of the following has Δ S° greater than zero? (A) CaO ( s )+ CO 2( g ) leftharpoons CaCO 3( s ) (B) NaCl ( aq ) leftharpoons NaCl ( s ) (C) NaNO 3( s ) leftharpoons Na + ( aq )+ NO 3- ( aq ) (D) N 2( g )+3 H 2( g ) leftharpoons 2 NH 3( g )

Tardigrade Admin · Accepted Answer

Here, the number of product species is greater than the number of reactant species. So it leads to positive value of entropy.

Q. Which one of the following has $Δ S^{\circ}$ greater than zero?

$C a O_{(s)} + C O_{2 (g)} ⇌ C a C O_{3 (s)}$

$N a C l_{(a q)} ⇌ N a C l_{(s)}$

$N a N O_{3 (s)} ⇌ N a^{+}_{(a q)} + N O_{3}^{-}_{(a q)}$

$N_{2 (g)} + 3 H_{2 (g)} ⇌ 2 N H_{3 (g)}$

Here, the number of product species is greater than the number of reactant species. So it leads to positive value of entropy.

Q. Which one of the following has ΔS∘ greater than zero?

CaO(s)​+CO2(g)​⇌CaCO3(s)​

NaCl(aq)​⇌NaCl(s)​

NaNO3(s)​⇌Na+(aq)​+NO3−​(aq)​

N2(g)​+3H2(g)​⇌2NH3(g)​

Here, the number of product species is greater than the number of reactant species. So it leads to positive value of entropy.

Q. Which one of the following has $Δ S^{\circ}$ greater than zero?

$C a O_{(s)} + C O_{2 (g)} ⇌ C a C O_{3 (s)}$

$N a C l_{(a q)} ⇌ N a C l_{(s)}$

$N a N O_{3 (s)} ⇌ N a^{+}_{(a q)} + N O_{3}^{-}_{(a q)}$

$N_{2 (g)} + 3 H_{2 (g)} ⇌ 2 N H_{3 (g)}$