Unformatted text preview: #i ‘The French chemists Pierre L. Dulong and Alexis
'T. "Petit noted in 1819 that the molar heat capacity of
many solids at ordinary temperatures is proportional to
the number of atoms per formula unit of the solid. They
quantified their observations in what is known as Dulong
and Petit’s rule, which says that the molar heat capacity
of a solid can be expressed as (:P = N x 25JK'1mor‘ where N is the number of atoms per formula unit. The
observed heat capacity per gram of a compound contain
ing thallium and chlorine is 0.208 jK‘lg'l. Use
Dulong and Petit’s rule to determine the formula of the compound. “11:2. The mineral stilleite contains zinc and selenium.
The observed heat capacity per gram is 0.348JK'1g"1.
Use Dulong and Petit’s rule (seédeUEJ to determine
the formula of stilleite. £33. The heat capacity per gram of an oxide of rubid
ium is 0.64jK“1g‘1. Use Dulong and Petit’s rule (‘SQ‘E
OJox'NEF ) to determine the formula of the compound. #4 . The mineral matlockite contains lead, ﬂuorine,
and chlorine. The observed heat capacity per gram (spe
ciﬁc heat) of matlockite is 0.290]K"1g_1. Use Dulong
and Petit’s rule (SEE alum/6: ) to determine the formula
of matlockite. ...
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 Spring '11
 AprilAdrian

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