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# Problem: Predict the sign of the entropy change of the system for each of the following reactions.(a) N2 (g) + 3H2 (g)  →  2NH3 (g)(b) CaCO3(s)  →  CaO(s) + CO2(g)(c) 3C2H2(g)  →  C6H6(g)(d) Al2O3(s) + 3H2 (g)  →  2Al(s) + 3H2O(g)

###### FREE Expert Solution

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.

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###### Problem Details

Predict the sign of the entropy change of the system for each of the following reactions.
(a) N2 (g) + 3H2 (g)  →  2NH3 (g)
(b) CaCO3(s)  →  CaO(s) + CO2(g)
(c) 3C2H2(g)  →  C6H6(g)
(d) Al2O3(s) + 3H2 (g)  →  2Al(s) + 3H2O(g)

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

Our tutors have indicated that to solve this problem you will need to apply the Entropy concept. You can view video lessons to learn Entropy. Or if you need more Entropy practice, you can also practice Entropy practice problems.