Question

What increases in processes in which solid or liquid reactants form gaseous products and when solid reactants form liquid products?

Answer 1

entropy

For a given substance, the entropy of the liquid state is greater than the entropy of the solid state. Likewise, the entropy of the gas is greater than the entropy of the liquid. Therefore, entropy increases in processes in which solid or liquid reactants form gaseous products. Entropy also increases when solid reactants form liquid products.