Heat capacity, 6, 10 of reaction

Prom the following thermodynamic data, with the assumptions that the heat capacities of reaction are negligible and that standard conditions (other than temperature) prevail, calculate the temperatures above which (a) carbon monoxide becomes the more stable oxide of carbon, in the presence of excess C (6) carbon is thermodynamically capable of reducing chromia (Cr2Os) to chromium metal (c) carbon might, in principle, be used to reduce rutile to titanium metal and (d) silica (taken to be a-quartz) may be reduced to silicon in a blast furnace. 

Taking the derivative of the enthalpy of reaction with respect to temperature yields the heat capacity of reaction at a constant pressure ArCP ... 

ArCp standard heat capacity of reaction (J K 1 mol1)... 

The heat capacity of reaction could also be calculated from... 

Table A-26 Enthalpy, entropy and heat capacity of reaction for the hydrolysis reactions of Th(IV) in 1 m (Na)C104. In the last two colunuis are given the enthalpy and entropy of reaction divided by the number of OH-groups in the complex.

Table A-26 Enthalpy, entropy and heat capacity of reaction for the hydrolysis...

Heat capacity of reaction mixture Standard enthalpy changes... 

Here Gr, Gc, Crr, Crc mass flow and heat capacity of reaction mixture and coolant, accordingly. 

Method 2 If temperature is below about 150°C, the approximation that the heat capacity of reaction does not change, AjCp = ArCpxo can be used. In this case. Equation 4.21 can be combined with Equations 4.1 through 4.3 to derive the following expression ... 

Galvanic potential difference of hydrogen electrode [V] Standard isobaric heat capacity of reaction [J (mol K) ] Standard isobaric heat capacity of reaction at standard temperature Tq [J (mol K) ]... 

Heat capacity of reaction charge Water 150 x 1.0 Ethyl acrylate 100 x 0.47 Methyl methacrylate 50 x 0.45 TOTAL... 

In Equations 4.40 and 4.41, H°j, 5 Sj, and ACpj are the standard enthalpy, standard entropy, and heat capacity of reaction y, respectively. By substituting Equations 4.39 through 4.41 in Equation 4.38, the following equation is derived ... 

Applying the same concept, it is possible to obtain the coefficients for calculating the heat capacity of reaction j (ACp). The thermodynamic data and constants for the calculation of heat capacity needed for the solution of these equations are presented in Tables 4.2 and 4.3 ... 

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