Which reaction produces a decrease in the entropy of the system? My question is,

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Which reaction produces a decrease in the entropy of the system? My question is, how do I answer this quickly without having a table of entropies available? Which reaction produces a decrease in the entropy of the system? Na(s) + 1/2Cl2(g) ? NaCl(s) 2HgO(s) ? 2Hg(l) + O2(g) CO2(s) ? CO2(g) H2O(s) ? H2O(g) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) Which reaction produces a decrease in the entropy of the system? My question is, how do I answer this quickly without having a table of entropies available? Which reaction produces a decrease in the entropy of the system? Na(s) + 1/2Cl2(g) ? NaCl(s) 2HgO(s) ? 2Hg(l) + O2(g) CO2(s) ? CO2(g) H2O(s) ? H2O(g) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) Which reaction produces a decrease in the entropy of the system? Na(s) + 1/2Cl2(g) ? NaCl(s) 2HgO(s) ? 2Hg(l) + O2(g) CO2(s) ? CO2(g) H2O(s) ? H2O(g) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) Which reaction produces a decrease in the entropy of the system? Na(s) + 1/2Cl2(g) ? NaCl(s) 2HgO(s) ? 2Hg(l) + O2(g) CO2(s) ? CO2(g) H2O(s) ? H2O(g) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) Which reaction produces a decrease in the entropy of the system? Na(s) + 1/2Cl2(g) ? NaCl(s) 2HgO(s) ? 2Hg(l) + O2(g) CO2(s) ? CO2(g) H2O(s) ? H2O(g) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) Na(s) + 1/2Cl2(g) ? NaCl(s) 2HgO(s) ? 2Hg(l) + O2(g) CO2(s) ? CO2(g) H2O(s) ? H2O(g) 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g)

Explanation / Answer

Na(s) + 1/2Cl2(g) ? NaCl(s)

look at the change in phases, whenever gas reactant produces solid/liquid entropy decreases.

like here cl2 is gas but nacl is solid

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