Question

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

• A. $CaO _{( s )}+ CO _{2( g )} \rightleftharpoons CaCO _{3( s )}$
• B. $NaCl _{( aq )} \rightleftharpoons NaCl _{( s )}$
• C. $NaNO _{3( s )} \rightleftharpoons Na ^{+}{ }_{( aq )}+ NO _{3}^{-}{ }_{( aq )}$
• D. $N _{2( g )}+3 H _{2( g )} \rightleftharpoons 2 NH _{3( g )}$

Answer 1

Answer: (C)

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