The molar enthalpy of fusion (ΔHo) of ammonia is 5.65 kJ/mol, and the molar entropy of fusion (ΔSo) of ammonia?
The molar enthalpy of fusion (ΔHo) of ammonia is 5.65 kJ/mol, and the molar entropy of fusion (ΔSo) of ammonia is 28.9 J/mol K. Calculate ΔGoat 25oC. for the melting of 10.0 moles of ammonia. (Enter your answer in kJ).
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Using ΔGo = ΔHo - T ΔSo
ΔGo = (5.65 kJ mol-1 x 10 mol) - 298 K x (28.9 J K-1 mol-1 x 10 mol)
Note the temperature must be in kelvin and not in degrees celcius
ΔGo = 56.5 kJ - 298 K x 289 J K-1
ΔGo = 56500 J - 86122 J
ΔGo = -29622 J or -29.6 kJ to 3 s.f.