Question

For the melting of sodium chloride, ΔHfusion = 28.16 kJ/mol and ΔSfusion = 26.22 J/(K⋅mol). Calculate ΔSsurr at 1074 K.

Express your answer using two decimal places. ΔSsurr = ______________ J/K

Answer 1

Answer – We are given the ∆Hfus = 28.16kJ/mol, temp, T = 1074 K

We know, ∆Ssur= ∆H/T

                          = 2.816*10⁴ J.mol^-1 / 1074 K

                          = 26.22 J.mol^-1/K

So for 1 moles of NaCl , , ∆Ssur = 26.22 J/K