# Does the following reaction show an increase or decrease in entropy? N2(g)  +  3 H2(g)  --->  2 NH3(g)

Entropy is associated with the degree of disorder, or number of degrees of freedom. In the reaction ${N}_{2} + 3 {H}_{2} - \to 2 N {H}_{3}$ we start with four moles of gaseous reactants! and end with two moles of gaseous products, which is less disordered.