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.
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)
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What scientific concept do you need to know in order to solve this problem?
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