Given that for the melting of sodium chloride Hfusion = 28.16 kJ/mol and Sfusion

Question

Given that for the melting of sodium chloride Hfusion = 28.16 kJ/mol and Sfusion = 26.22 J/(Kmol), calculate G for the melting of sodium chloride the following temperatures. Predict whether NaCl will melt at each of these temperatures and 1 atm pressure.

Part A

1050 K

Express your answer using two decimal places.

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Part B

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Part C

1074 K

Express your answer using two decimal places.

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Part D

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Part E

1095 K

Express your answer using two decimal places.

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Part F

Explanation / Answer

Given :

Delta Hfus = 28.16 kJ/mol= 28160 J/mol

Delta S fus = 26.22 J/ kmol

We use following formula to get delta G

Delta G = Delta H – T delta S

Part A ) T = 1050 K

Lets plug this value in above equation

Delta G = 28160 J / mol – (1050 K x 26.22 J / K mol)

=629 J / mol

= 0.63 kJ/mol

Part B:

Since the value of delta G is positive so it will not melt..

Part C

T = 1074 K

Delta G = 28160 J / mol – (1074 K x 26.22 J / K mol)

= 0 kJ

Part D

NaCl will melt.

Part E

T = 1095 K

Delta G = 28160 J / mol – (1095 K x 26.22 J / K mol)

=- 0.550 kJ/mol

Part F

Delta G is negative so NaCl will melt.

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