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

For a perfectly crystalline solid `C_(p.m.)=aT^(3)`, where ais constant. If `C_(p.m.)` is 0.42.J//K-"mol" at 10K, molar entropy at 10K is:

A

0.42 J/k mol

B

0.14 J/K mol

C

1.12 J/K mol

D

zero

Text Solution

Verified by Experts

The correct Answer is:
C
`0.42=a(10)^(3)impliesa=0.42xx10^(-3)`
`S_(m)=int_(0)^(20)(C_(p,m))/(T)dT`
`=int_(0)^(20)aT^(2)dT=(a)/(3)[20^(3)-0]`
`=1.12 J//K-"mol"`
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NARENDRA AWASTHI-THERMODYNAMICS-Exercise
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  2. Calculate DeltaS for following process : underset("at" 100K)(X(s)) ...

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  3. For a perfectly crystalline solid C(p.m.)=aT^(3), where ais constant. ...

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  4. Consider the following spontaneous reaction 3X(2)(g)rarr2X(3)(g). What...

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  5. For the reaction 2H(g)rarr H(2)(g), the sign of DeltaH and DeltaS resp...

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  6. Consider the following reaction. C(6)H(6)(l)+(15)/(2)O(2)(g)rarr6CO(...

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  7. Consider the following reaction at temperature T : CH(2)=CH(2)(g) +...

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  8. For a process to be spontaneous, DeltaG must be………… .

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  9. For a reaction to occur spontaneously

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  10. Which of the following conditions reagarding a chemical process ensure...

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  11. The free energy change DeltaG = 0, when

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  12. Which of the following conditions regarding a chemical process ensures...

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  13. Suppose that a reaction has DeltaH=-40kJ and DeltaS =- 50J//K. At what...

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  14. For isothermal expansion in case of an ideal gas :

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  15. What is the normal boiling point of mercury? Given : DeltaH (f)^(@)...

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  16. 19 gm of ice is converted into water at 0^(@)C and 1 atm. The entropie...

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  17. Using the listed [DeltaG(f)^(@) values] calculate DeltaG^(@) for the r...

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  18. From the following DeltaH^(@) and DeltaS^(@) values, predict which of ...

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  19. Calculate DeltaH(f)^(@) for Ubr(4) from the DeltaG^(@) of reaction and...

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  20. The entropies of H(2) (g) and H (g) are 130.6 and 114.6 J mol^(-1)K^(-...

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