🤓 Based on our data, we think this question is relevant for Professor Charlier's class at BSU.
Without doing any calculations, determine the sign of ΔSsys for each of the following chemical reactions.
a. Mg(s) + Cl2(g) → MgCl2(s)
b. 2 H2S(g) + 3 O2(g) → 2 H2O(g) + 2 SO2(g)
c. 2 O3(g) → 3 O2(g)
d. HCl(g) + NH3(g) → NH4Cl(s)
We’re being asked to predict the sign of the entropy change (ΔS) for the given reactions.
Recall that if:
• ΔS > 0 or ΔS = (+); entropy is increased
• ΔS < 0 or ΔS = (–); entropy is decreased
Remember that phase changes lead to a change in entropy:
Also, recall that an increase in the number of gas molecules in the reaction also leads to an increase in entropy.