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State the third law of thermodynamics....

State the third law of thermodynamics.

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Third law of thermodynamics : The entropy of a pure and perfectly crystaline substance is zero at the absolute zero of a temperature `(-273^@C)`
`S_("lim T" to 0)=0`
This law imposes a limination on the value of entropy.
`S_T=underset(0)overset(T)int C_P/T. dT`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-THERMODYNAMICS-Short Answer Questions
  1. State the third law of thermodynamics.

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  2. What are open, closed and isolated systems ? Give one example for each...

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  3. Define the state function and state variables. Give examples.

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  4. "Internal energy is a state function." Explain.

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  5. "Work is not a state function." Explain.

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  6. What is heat? Explain.

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  7. Derive the equation for 'W("rev")' in isothermal reversible process.

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  8. Two litres of an ideal gas at a pressure of 10 atm expands isothermall...

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  9. If the ideal gas given in the problem 45 expands against constant exte...

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  10. If the ideal gas given in the problem 45 expands to a final volume of ...

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  11. Explain the state function 'enthalpy, H'. What is the relationship bet...

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  12. Show that DeltaH=DeltaU+Deltan((g)),RT

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  13. If water vapour is assumed to be a perfect gas, molar enthalpy change ...

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  14. Explain extensive and intensive properties.

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  15. Define heat capacity. What are C(p) and C(v)? Show that C(p)-C(v)=R.

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  16. Explain the determination of DeltaU of a reaction calorimetrically.

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  17. Explain the determination of DeltaH of a reaction calorimetrically:

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  18. What is enthalpy of a reaction? Explain the standard enthalpy of a rea...

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  19. What is the standard enthalpy of formation? Explain it with example.

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  20. Define and explain enthalpy of phase transformation.

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