Collectively, compounds which have fewer hydrogen atoms than an alkane with the same number of carbon atoms are called unsaturated hydrocarbons. Likewise, compounds containing a carbon-to-carbon triple bonds (R–C≡C–R) called alkynes ( Discussed in Chapter 9), also have fewer hydrogens than the corresponding alkane. The presence of a double bond causes alkenes to have less hydrogens than an alkane with the same number of carbons. #color(blue)(barC_V) = 3/2R + 2/2R + 0.9822R = 3.4822R#Īnd indeed, even closer! (less than #0.2%# error.\)īecause alkanes have the maximum number of H atoms possible according to the rules of covalent bonds, alkanes are also referred to as saturated hydrocarbons. So, the corrected value of #barC_V# is now: #barC_(V,"vib") = R#Įventually, you should get #color(green)(barC_(V,"vib") = 0.9822R)# (and not #R#, like the equipartition theorem would have given you). So at #"298.15 K"#, we have this hefty calculation (try storing variables and recalling them if that helps):
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