A . Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong
B . Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state
C . Generally, the heat capacities of compounds are lower in the liquid than in the solid state
D . The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist
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