1. Look up the temperatures of the known phase transitions for trans-stilbene, a

Question

1. Look up the temperatures of the known phase transitions for trans-stilbene, ammonium chloride, and p-azoxyanisole that fall in the temperature range 0-200 celsius.

2. The samples are contained in aluminum pans with crimped-on covers. The instrument is stationary during operation, so samples placed in open pans would not spill. Why do you think the covers are needed?

3. What is the refractive index of liquid ethanol at room temperature at wavelengths near 600 nm?

4. What are the fundamental vibrational frequencies of dichloromethane? Which of these vibrations are observed in the infrared spectrum? Which are observed in the Raman spectrum?

5. What is the enthalpy of vaporization, in kJ/mole, of n-hexane at its normal boiling point?

6. What is the activation energy for the cis to trans isomerization of 2-butene in the gas phase?

7. What are the wavelength and peak molar absorptivity of the longest-wavelength maximum in the UV-visible absorption spectrum of –carotene in liquid solution at room temperature?

Explanation / Answer

1. Look up the temperatures of the known phase transitions for trans-stilbene, a

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