Scientific Tutor

How does Entropy Relate to the Moles of a Chemical Equation?

Without looking at an entropy table, are these chemical equations below increasing or decreasing in entropy (Δ S) based on the number of molecules?

2 N₂O_3(g) ——> 2 N_2(g) + 3 O_2(g)

Answer: Increasing (2 —> 5)

N_2(g) + 3 H_2(g) —-> 2 NH_3(g)

Answer: Decreasing (3 —> 2)

2 H₂O_(g) —-> 2 H_2(g) + O_2(g)

Answer: Increasing (2 —> 3)

2 Mg_(s) + O_2(s) —> 2 MgO_(s)

Answer: Decreasing (3 —> 2)

MgBr_2(aq) + 2 NaI_(aq) ——> MgI_2(aq) + 2 NaBr_(aq)

Answer: Not increasing or decreasing (3 —> 3)