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For a perfectly crystalline solid C(p.m....

For a perfectly crystalline solid `C_(p.m.)=aT^(3)+bT`,where a and b constant . If `C_(p.m.)is 0.40J//Kmol` at 10K and `0.92J//K "mol" at 20K` then molar entropy at 20k is:

A

`0.92J..K"mol"`

B

`8.66 J//K "mol"`

C

`85xx1.5 J//K^(-1)`

D

None of these

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The correct Answer is:
C
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