Specific heat of compounds

With the assumption that the specific heat of the compound is 1700 J/kg/K, the compound... 

Accumulated data to date indicates that is relatively insensitive to the details of the structure of species. Consequently, additivity rules and model compounds, in conjunction with statistical mechanics, can readily be used to estimate entropies and specific heats of molecules and radicals. These estimates generally are accurate within l.Ocal/mol-K, leading to uncertainties in rate and equilibrium constants well within 20%. 

A linear term has been observed in the specific heats of the larger metal cluster compounds measured down to 20 mK [49, 56], The value of the linear term of these cluster compounds, which have metal cores of Pt309 and Pd 551, is only a fraction ( 1/3) of the bulk value. We might extrapolate to AU55, and use a fraction smaller than 1/3. But even using 1/3, the linear term would only become equal to the cubic term at about 15 mK. 

Addnl Refs A) C. Lenchitz, "Ice Calorimeter Determination of Enthalpy and Specific Heat of Eleven Organometallic Compounds , PATR 2224 ( 1955) B) R. Veliky et al, "Enthalpy Change, Heat of Fusion, and Specific Heat of Basic Explosives , PATR 2504(1959) c) L.M. Fingerson, "Research on the Development and Evaluation of a Two-Sensor.Enthalpy Probe , Thermo Systems Inc Rept ARL 64-161 (Oct 1964) [Contract AF 33(657)-9917] D) D.E. Adams,... 

Fig. 6.4 Specific heat of (V4 xTi )203 divided by T plotted against T2. The first number on each line shows x, the second the proportion of the compound in the alloy phase...

The specific heat of cyclonite is 0.30 cal/g°C, its heat of combustion 2285 kcal/kg, and its heat of formation — 96 kcal/kg, i.e. — dHf=—21.3 kcal/mole. Cyclonite is therefore an endothermic compound and this is one of the factors which render it so highly explosive. 

Now according to the rule of Dulong and Petit the specific heat of a compound is usually nearly equal to that of the sum of its components. The change in entropy AS, in a reaction between solids only, is usually, therefore, very small, and even if the heat effect is relatively low, the temperature will not cause the compound that is stable at low temperatures to decompose at higher, the... 

Imagine that you dissolve 10.0 g of a mixture of NaN03 and KF in 100.0 g of water and find that the temperature rises by 2.22°C. Using the following data, calculate the mass of each compound in the original mixture. Assume that the specific heat of the solution is 4.18 J/ (g °C). 

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