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Thermal Expansion

For a melting...

Question

For a melting of NaCl heat required is 7.26kcal mol and Entropy change increased by 6.73 cal mol .the melting of the salt is

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Q. For the melting of

N a C l

heat required is

7.26 k c a l m o l^{- 1}

Δ S

6.73 c a l m o l^{- 1} K^{- 1}

. The melting point of the salt is:

Q. For a liquid, enthalpy of fusion is

1.435 k c a l m o l^{- 1}

and molar entropy change is

5.26 c a l m o l^{- 1} K^{- 1}

The melting point of the liquid is:

Q. Enthalpy of fusion of a liquid is

1.435 k c a l m o l^{- 1}

and molar entropy change is

5.26 c a l m o l^{- 1} K^{- 1}

, hence melting point of liquid is

Q. The melting point of a solid is

200 K

and its latent heat of fusion is

400 c a l m o l^{- 1}

. The entropy change for the fusion of 1 mole of the solid

(i n c a l K^{- 1})

at the same temperature would be

N a C l (s)

on melting absorbed

32.76 k J

of heat and its entropy is increased by

30 J K^{- 1}

. What is the melting point of sodium chloride?

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