Answer to Question #192346 in Physical Chemistry for Ronewa

Question #192346

Calculate the Gibbs energy, entropy, and enthalpy of mixing when 2.00 mol C6H14

(hexane) is mixed with 3.00 mol C7H16 (heptane) at 298 K; treat the solution as ideal


1
Expert's answer
2021-05-17T04:19:54-0400

First we calculate the mole fraction of hexane and heptane 

Calculating Gibbs energy using the

(1+1)mol×(8.3145J/k/mol)(298k)×[0.5(In0.5)+0.5(In0.5)]

=3.43kJ/mol

Now we calculate entropy

(1+1)mol×(8.3145J/k/mol)*298k×[0.5(In0.5)+0.5(In0.5)]

=3.43J/K

Then we calculate enthalphy of mixing using

= -3.43 + 3.43

=0J/mol


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