What is ΔSsys for a freezing phase transition at -3.0 °C for a compound that freezes...

Question

Question

What is ΔS_sys for a freezing phase transition at -3.0 °C for a compound that freezes at -3.0 °C and the ΔH_sys = -19.88 kJ mol^-1 for this process?

Express your answer in J mol^-1 K^-1.

science chemistry

Answer 1

Answer #1

ΔHsys = -19.88 KJ/mol

= -19880 J/mol

T = -3.0 oC

= (-3.0 + 273.1) K

= 270.1 K

Use:

ΔSsys = ΔHsys/T

= -19880 J/mol / 270.1 K

= -73.6 J/mol.K

Answer: -73.6 J/mol.K

Answer 2

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