The standard entropies at 298 K for certain of the group 4Aelements are as follo

Question

The standard entropies at 298 K for certain of the group 4Aelements are as follows: C (s, diamond) = 2.43 J/mol-K;    Si(s) = 18.81 J/ mol-K;   Ge(s)=31.09 J/mol-K; and Sn(s) = 51.18 J/ mol-K All but Sn have the diamond structure. How do you account for the trend in the Sovalues? The standard entropies at 298 K for certain of the group 4Aelements are as follows: C (s, diamond) = 2.43 J/mol-K;    Si(s) = 18.81 J/ mol-K;   Ge(s)=31.09 J/mol-K; and Sn(s) = 51.18 J/ mol-K All but Sn have the diamond structure. How do you account for the trend in the Sovalues?

Explanation / Answer

As you progress down the group, the elements become bigger and bigger.  Even though they all contain diamond structures, their molar masses are different. The bigger and element, the more "random" they are as they have more matter. Thus, the entropy increases down the group because the elements are bigger than the one before it. Carbon has the lowest entropy as it is the smallest elements, while Tin is has the highest beause it is the biggest element.

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