Indicate which one of the following reactions most certainly results in a negative DSsys. CaCO3(s) —CaO(s)...

Question

Question

Answer 1

Answer #1

$\Delta$ S sys is -ve for the reaction of B.

H2O(g) ----------- H2O(s)

$\Delta$ S sys = $\Delta$ S products - $\Delta$ S reactants

Entropy for solid compounds is very less and for gaseous compounds entropy is more.

In the above reaction,

Products are in solids, SO the entropy is less

Reactants are in gaseous , So the entroly is more.

Hence, $\Delta$ S sys is negative for this reaction.

Answer 2

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