Consider the entropy change in the following chemical or physical processes:2 Na(s)  +  Cl2(g)  →  2 NaCl(s)N2(g)  +  3 H2(g)  →  2 NH3(g)H2O(s)  →  H2O(l)C10H22(l)  →  C10H22(s)2 Mg(s)  +  O2(g)  →    2 MgO(s)In which of these processes is entropy increased?Question 8Select one:Entropy is increased in # 2 and # 3None. Entropy is decreased on all these processesEntropy is increased in #1, #4 and #5Entropy is increased in all five processes Entropy is increased in # 3 only.

Entropy is a measure of the disorder or randomness of a system. In a chemical reaction, entropy increases when the number of molecules of gas increases, or when a solid or liquid turns into a gas.

1. 2 Na(s) + Cl2(g) → 2 NaCl(s): The entropy decreases because we are going from 3 moles of reactants (2 moles of Na and 1 mole of Cl2) to 2 moles of product (NaCl).

2. N2(g) + 3 H2(g) → 2 NH3(g): The entropy decreases because we are going from 4 moles of gas reactants (1 mole of N2 and 3 moles of H2) to 2 moles of gas product (NH3).

3. H2O(s) → H2O(l): The entropy increases because we are going from a solid to a liquid, which is a more disordered state.

4. C10H22(l) → C10H22(s): The entropy decreases because we are going from a liquid to a solid, which is a less disordered state.

5. 2 Mg(s) + O2(g) → 2 MgO(s): The entropy decreases because we are going from 3 moles of reactants (2 moles of Mg and 1 mole of O2) to 2 moles of product (MgO).

So, the correct answer is "Entropy is increased in # 3 only."