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Some element can be either solid or liquid. At the melting point, the liquid has 8 × 10-22 J more enthalpy per atom than the solid. The liquid also has 6 × 10-24 J/K more entropy per atom than the solid.

1) What is the latent heat per mole of the phase transition between the solid and the liquid?

? J/mole

2) At what temperature does the melting transition occur?

Tmelting = ? K

Respuesta :

boffeemadrid

Answer:

481.76 J/mol

133.33 K

Explanation:

[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}[/tex]

Change in enthalpy is given by

[tex]\Delta H=8\times 10^{-22}\times 6.022\times 10^{23}\\\Rightarrow \Delta H=481.76\ J/mol[/tex]

Entropy is given by

[tex]\Delta S=6\times 10^{-24}\times 6.022\times 10^{23}\\\Rightarrow \Delta S=3.6132\ J/mol K[/tex]

Latent heat of fusion is given by

[tex]L_f=\Delta H\\\Rightarrow L_f=481.76\ J/mol[/tex]

The latent heat of fusion is 481.76 J/mol

Melting point is given by

[tex]T_m=\dfrac{L_f}{\Delta S}\\\Rightarrow T_m=\dfrac{8\times 10^{-22}\times 6.022\times 10^{23}}{6\times 10^{-24}\times 6.022\times 10^{23}}\\\Rightarrow T_f=133.33\ K[/tex]

Melting occurs at 133.33 K

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