Naphthalene, CioHs, used to be the primary chemical component of mothballs. (It

Question

Naphthalene, CioHs, used to be the primary chemical component of mothballs. (It has since been replaced with less flammable substances.) The boiling point of naphthalene is 218 °C. At this temperature, which two physical states are in equilibrium? a. Report the balanced chemical reaction equation for the state change that occurs at the boiling point. b. C. At the boiling point, what is the value of 6(in kJ) for the above reaction? d. The enthalpy of vaporization for naphthalene (AHvap) is 43.3 kJ/mol. Determine the entropy of vaporization (ASvap, in J/K mol) for this compound.

Explanation / Answer

Naphthalene

a. At the boiling point of naphthalene 218 oC, the two states in equilibrium are solid and the liquid phases.

b. Balanced chemical equation for the phase change at the boiling point would be,

Naphthalene (s) <===> Naphthalene (liquid)

c. at this boiling point,

dG = 252.38 kJ/mol

d. with enthalpy of vaporization for naphthalene dHvap = 43.3 kJ/mol

boiling point = 218 oC + 273 = 491 K

we get,

entropy of vaporization dSvap = 43.3 x 1000/491 = 88.19 J/K.mol

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