Compound specific heat capacity

If a substance is heated without a change of state, the amount of heat required to change the temperature of 1 gram by 1° C is called the specific heat capacity of the substance. Similarly, the molar heat capacity is the amount of heat needed to raise the temperature of 1 mole of a substance by 1° C. Table 7-2 shows the heat capacities of several elements and compounds. 

Water has a relatively high specific heat capacity, whereas inorganic compounds have lower heat capacities. Organic compounds are in the medium range (Table 2.2). 

The specific heat capacity of a mixture can be estimated from the specific heat capacities of the different compounds by a mixing rule ... 

The specific heat of reaction is 125 kj mol"1 (aromatic compound) and the specific heat capacity of the reaction mixture is 2.8kjkg 1 K"1. What maximum temperature (MTSR) could the reaction mass reach if the heating cooling system fails to stabilize at 125 °C ... 

Consider the portions of the heating curves shown here. Which compound has the highest specific heat capacity ... 

Fig. 3.22. (a) Temperature dependence of the reciprocal susceptibility of the cubic UX3 compounds (Buschow and Van Daal 1972). (b) Temperature dependence of the electrical resistivity of the cubic UX3 compounds (Buschow and Van Daal 1972). (c) Temperature dependence of the specific heat capacity of UX3 compounds, plotted as C/T versus T2. The straight lines correspond to C = yT + bT2 (Van... 

Usually, the molar and specific heat capacities or pure substances and compounds vary with temperature, and the molar heat capacity is usually provided by the polynomial equation ... 

Table 6.2 Specific Heat Capacities (c) of Some Elements, Compounds, and Materials ...

An aqueous waste stream with a maximum concentration of 0.50 M H2SO4 (d = 1.030 g/mL at 25 C) is neutralized by controlled addition of 40% NaOH (d = 1.430 g/L) before it goes to the process sewer and then to the chemical plant waste treatment facility. A safety review finds that the waste stream could meet a small stream of an immiscible organic compound, which could form a flammable vapor in air at 40.°C. The maximum tempCTa-ture reached by the NaOH solution and the waste stream is 31°C. Could the temperature increase due to the heat transferred by the neutralization cause the organic vapor to explode Assume the specific heat capacity of each solution is 4.184 J/g K. 

These properties give water the ability to dissolve many ionic and polar compounds. Water s high specific heat capacity and heat of vaporization give Earth and its organisms a narrow temperature range. 

In injection molding, a timeless contact temperature is established between the cavity and the molten plastic. The cavity temperature varies only slightly < 15 K) however, the surface layer of the molten plastic is spontaneously quenched to much more than 100 K. The molding compound freezes suddenly on the cavity wall. The decisive variable of the contact temperature is the heat sensitivity b. It is calculated by the thermal conductivity/ , the densityp and the specific heat capacity c. 

In addition to the thermal conductivity, the heat transfer of the compound into the material of the mold wall is an important factor. The heat penetration is determined by the thermal conductivity, density, and specific heat capacity. Table 3.12 shows the values of various commonly used mold materials. BeCu alloys showa very good... 

The entropy of a particular compound at a specific temperature can be determined through measurements of the heat capacity as a function of temperature, adding entropy increments connected with first-order phase transitions of the compound ... 

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