Self-test 2.3 The molar enthalpy of vaporization of benzene at its boiling point
(353.25 K) is 30.8 kJ mol−1. What is the molar internal energy change? For how
long would the same 12 V source need to supply a 0.50 A current in order to
vaporize a 10 g sample? [+27.9 kJ mol−1, 6.6 × 102 s]