Potassium heat capacity

Potassium Pentaborate Tetrahydrate. Potassium pentaborate tetrahydrate, KB Og 4H2O or K2O -5B202 8H20 formula wt, 293.20 orthorhombic prisms sp gr, 1.74 heat capacity, 329.0 J/(mol-K) [78.6 cal/(mol-K)] at 296.6 K is much less soluble than sodium pentaborate (Tables 9 and 10). Heat capacity measurements on the soHd have been made over a broad temperature range (85). 

Sf.I.F-Tfst 6.3A Potassium perchlorate, KC104, is used as an oxidizer in fireworks. Calculate the heat required to raise the temperature of 10.0 g of KCIO4 from 25°C to an ignition temperature of 900.°C. The specific heat capacity of KC1C4 is 0.8111... 

Here, Q is the heat energy input per area p and Cp are the density and specific heat capacity, respectively and indices g, d, and s refer to the gas, metal, and liquid sample layers, respectively. With Eq. (106), the thermal conductivity of the sample liquid is obtained from the measured temperature response of the metal without knowing the thermal conductivity of the metal disk and the thickness of the sample liquid. There is no constant characteristic of the apparatus used. Thus, absolute measurement of thermal conductivity is possible, and the thermal conductivities of molten sodium and potassium nitrates have been measured. ... 

A3 AIBN c Cp DLS DLVO DSC EO GMA HS-DSC KPS LCST Osmotic third virial coefficient 2,2 -Azobis(isobutyronitrile) Polymer concentration Partial heat capacity Dynamic light scattering Derjaguin-Landau-Verwey-Overbeek Differential scanning calorimetry Ethylene oxide Glycidylmethacrylate High-sensitivity differential scanning calorimetry Potassium persulphate Lower critical solution temperature... 

Qf -93.5kcal/mol Heat Capacity 23.96 cal/deg/mol at 298°K sol in w, alkalies or aq KC1 si sol in glycerol or ethyleneglycol nearly insol in abs ale or abs acet. Potassium chlorate is si to moderately poisonous the principal toxic effects are the production of methemoglobin and the destruction of red blood corpuscles. The probable lethal dose is 50-500mg/kg or betw one teaspoonful and one ounce for a 150-lb man... 

A 5.00-g chunk of potassium is dropped into 1.00 kg of water at 24.0°C. What is the final temperature of the water after the preceding reaction occurs Assume that all the heat is used to raise the temperature of the water, and assume that the specific heat capacity of the solution is... 

Pabalan, R., and Pitzer, K. S. (1988) Apparent Molar Heat Capacity and Other Thermodynamic Properties of Aqueous Potassium Chloride Solutions to High Temperatures and Pressures, J. Chem. Eng. Data 33, 354-362. 

This table lists standard enthalpies of formation AH°, standard third-law entropies S°, standard free energies of formation AG°, and molar heat capacities at constant pressure, Cp, for a variety of substances, all at 25 C (298.15 K) and 1 atm. The table proceeds from the left side to the right side of the periodic table. Binary compounds are listed under the element that occurs to the left in the periodic table, except that binary oxides and hydrides are listed with the other element. Thus, KCl is listed with potassium and its compounds, but CIO2 is listed with chlorine and its compounds. 

Solids. Only very rough approximations of solid heat capacities can be made. Kopp s rule (1864) should only be used as a last resort when experimental data cannot be located or new experiments carried out. Kopp s rule states that at room temperature the sum of the heat capacities of the individual elements is approximately equal to the heat capacity of a solid compound. For elements below potassium, numbers have been assigned from experimental data for the heat capacity for each element as shown in Table 4.2. For liquids Kopp s rule can be applied with a modified series of values for the various elements, as shown also in Table 4.2. For example, the heat capacity at room temperature of Na2S04 lOHaO would be 2(6,2) + 1(5.4) + 14(4.0) + 20(2.3) = 119.8 cal/(g mol)( C). The heat capacity of coal can be estimated from equations in the Coal Conversion Systems Technical Data Book cited in the supplementary references. Consult Reid or Perry s Handbook fpr tables of heat capacity data for solids. 

PAT/WOO] Patterson, B. A., Woolley, E. M., Thermodynamics of ionization of water at temperatures 278.15 K < T/K < 393.15 K and at the pressure p = 0.35 MPa apparent molar volumes and apparent molar heat capacities of aqueous of potassium and sodium nitrates and nitric acid, J. Chem. Thermodyn., 34, (2002), 535-556. Cited on pages 87, 88. 

A coffee-cup caiorimeter initiai iy contains 125 g water at 24.2°C. Potassium bromide (10.5 g), aiso at 24.2°C, is added to the water, and after the KBr dissoives, the final temperature is 21.1°C. Caicuiate the enthaipy change for dissolving the salt in J/g and id/moi. Assume that the specific heat capacity of the solution is... 

Fig. 5. Thermally induced unfolding of recombinant Sac7d ( ) and Sso7d (O) followed by CD (upper, A) and DSC (lower, B). The CD intensity at 205 nm was collected in I cm path length cuvettes with 0.01 mg/ml protein in 0.001 M potassium acetate (pH 5.5). The DSC (partial molar heat capacity) of Sac7d and Sso7d (1-2 mg/ml) was collected in O.OI M potassium acetate (pH 5.7) and 0.3 M KCl. Fitting of the DSC data gives a Tm for Sac7d of 90.4° and 100.2° for Sso7d.

As an example of the usage of equation (3.37), the average heat capacity of potassium between 25 and 60 is calculated ... 

Here Vp includes an additional volume due to the mass of the reactor itself in addition to the liquid volume in the reactor. The heat capacity CpKi is that of the catalyst, potassium iodide, and Cpp is that of the reactant, hydrogen peroxide. 

Estimate the molar entropy of potassium chloride at 5.0 K given that its molar heat capacity at that temperature is 1.2 mj K" mol" . 

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