IV. Pierre Dulong and Alexis Petit discovered long and Alexis Petit discovered i

Question

IV. Pierre Dulong and Alexis Petit discovered long and Alexis Petit discovered in 1819 that the molar specific heat capacities of 26 J/(mol C). This is most metals are approximately equal, with an average value of about nown, surprisingly, as the Law of Dulong and Petit. Use this average specific molar heat O.435 capacity in combination with your experimentally determined specific heatto estimate the -molar mass of a metal (look at the ratio between the two numbers and be sure the units divide to give you g/mol). O- 33

Explanation / Answer

According to Dulong and petit,

molar mass x specific heat of metal = 26 J/mol.oC

with,

specific heat of metal = 0.433 J/g.oC

we get,

molar mass of metal = (26 J/mol.oC)/(0.433 J/g.oC)

                                 = 60.05 g/mol

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