For the compounds listed below, estimate the constants in the equation for ideal gas heat capacity, equation 3.19, using the method given in Section 8.9.2.
1. 3-methyl thiophene.
2. Nitrobenzene.
3. 2-methyl-2-butanethiol.
4. Methyl-t-butyl ether.

Data from section 8.9.2

The dependence of gas specific heats on temperature was discussed in Chapter 3, Section 3.5. For a gas in the ideal state the specific heat capacity at constant pressure is given by:

Values for the constants in this equation for the more common gases can be found in the handbooks, and in Appendix C. Several group contribution methods have been developed for the estimation of the constants, such as that by Rihani and Doraiswamy (1965) for organic compounds. Their values for each molecular
group are given in Table 8.4, and the method illustrated in Example 8.9. The values should not be used for acetylenic compounds. The correction of the ideal gas heat capacity to account for real conditions of temperature and pressure was discussed in Chapter 3, Section 3.7.

Transcribed Image Text:

C=a+bT+cT+d[ (3.19)