# Problem: Predict the sign on ΔS° for the following reactionsi. 2 KClO4 (s) → 2 KClO3(s) + O2(g)ii. Propanol condenses at room temperatureiii. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)          Reaction i          Reaction ii          Reaction iiiA.          +                            +                           -B.           -                             +                          +C.           +                             -                          0 D.            -                            +                          0E.            +                            -                          -

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###### Problem Details

Predict the sign on ΔS° for the following reactions

i. 2 KClO4 (s) → 2 KClO3(s) + O2(g)

ii. Propanol condenses at room temperature

iii. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)

Reaction i          Reaction ii          Reaction iii

A.          +                            +                           -

B.           -                             +                          +

C.           +                             -                          0

D.            -                            +                          0

E.            +                            -                          -

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.

What is the difficulty of this problem?

Our tutors rated the difficulty ofPredict the sign on ΔS° for the following reactionsi. 2 KClO...as medium difficulty.

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Based on our data, we think this problem is relevant for Professor Ray's class at UIUC.