A triatomic molecule can have a linear configuration,as does CO2 (Fig. P21.68a), or it
Chapter 21, Problem 68(choose chapter or problem)
A triatomic molecule can have a linear configuration,as does CO2 (Fig. P21.68a), or it can be nonlinear, likeH2O (Fig. P21.68b). Suppose the temperature of a gasof triatomic molecules is sufficiently low that vibrationalmotion is negligible. What is the molar specific heatat constant volume, expressed as a multiple of the universalgas constant, (a) if the molecules are linear and(b) if the molecules are nonlinear? At high temperatures,a triatomic molecule has two modes of vibration,and each contributes 12R to the molar specific heat for itskinetic energy and another 12R for its potential energy.Identify the high-temperature molar specific heat atconstant volume for a triatomic ideal gas of (c) linearmolecules and (d) nonlinear molecules. (e) Explain howspecific heat data can be used to determine whether atriatomic molecule is linear or nonlinear. Are the datain Table 21.2 sufficient to make this determination?
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