Answer:
The correct answer is: Only Reaction 1.
Explanation:
Ok, let us define what entropy is: entropy is a measure of the random activity in a system, and there are several factors which can affect the amount of entropy in a system - for example when you increase temperature, you increase entropy.
In this case,
Reaction 1: NaCl(s) → Na+(aq)+Cl- (aq): In this reaction you are solvating the atoms of Na+ and Cl-, or in other words, you are passing a compound from the solid state to the liquid state, which causes the entropy to increase. Liquids have more energy and entropy than solids.
Reaction 2: N2(g) + 3H2(g) → 2NH3(g): In this case you are getting a gaseous product from gaseous reactants, and although there is positive entropy, it does not increase.
