Calculate the standard entropy change at 25 degree C for: C_3H_8(g) + 5 O_2(g) r

Question

Calculate the standard entropy change at 25 degree C for: C_3H_8(g) + 5 O_2(g) rightarrow 3 CO_2(g) + 4 H_2O(g) +877.9 J/K +100.5 J/K -72.9 J/K +72.9 J/K +2692 J/K The half-life for the spontaneous decay of iodine-131 is 8.04 days. How much of a 0.50 g sample of this isc remains after 3.0 days? 0.39 g 0.13 g 0.28 g 0.11 g Assume Cu^2+(aq) + Ca(s) rightarrow Cu(s) + Ca^2+(aq) proceeds in the forward direction. We conclude: Ca(s) is oxidized and Cu^2+(aq) is reduced. Cu^2+(aq) is oxidized and Ca(s) is reduced. Ca(s) is oxidized and Ca^2+(aq) is reduced. Cu^2+(aq) is oxidized and Ca^2+(aq) is reduced. Cu(s) is oxidized and Ca(s) is reduced. Calculate the cell potential, at 25 degree C, for 3 Cr^2+(aq) + 2 Al(s) rightarrow 3 Cr(s) + 2 Al^3+(aq). Assume (Cr^2+) = 0.15 M and [Al^2+] = 0.0040 M. +0.73 V +0.44 V -2.64 V +0.77 V -0.75 V For which of the following reactions will the entropy of the system decrease?

Explanation / Answer

According to chegg website rules you will get answer for one question only. here you did not mention which answer you want.

The answer for the last quesiton in the picture is A.

in this reaction two molecules are combined to form one molecule. That means the randomness decreases. So, the entropy of the reaction decreases.

in the last option one gas molecule getting conveted two gases molecules so randomness increases and entropy increases.

in all other options the no of molecule increases so entropy increases.

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