Vessel proportions calculating

The amount of standardized acid needed is proportional to the amount of ammonia that bubbled through. It is an indirect method because the ammonia is determined but not titrated. It is determined indirectly by titration of H2B03. In a direct titration, the analyte would be reacted directly with the titrant, as per the discussion in Section 4.6. The concentration of the boric acid in the receiving vessel does not enter into the calculation and need not be known. Equation (4.40) is used for the calculation. 

In one of his experiments, Perrin [6] counted a total of 13,000 particles of gamboge and found average concentrations proportional to the numbers listed in Table 21.1 at the given heights (h) above the bottom of the vessel. The experiment was carried out at 298 K, and the density of the particles was 0.2067 kg dm greater than that of the water in which they were suspended. The mean radius of the particles was 2.12 x 10 m. Calculate Avogadro s constant from these data. 

In the simplest version of a surface reaction, the rate of termination of the chain reaction by reaction of R on a surface should be proportional to D, the square of the vessel diameter We will also leave this calculation for a homework problem, but the imphcations are profound for a chain reaction. When the vessel size increases, the rate of a chain reaction can increase drastically, from a slow surface-quenched process in small vessels to very fast process whose only quenching steps are homogeneous reactions. 

Known Variables — Controllable In any experimental situation, cettain conditions are held constant during the course of the experiment. A batch of copolymer may be made with a measured quantity of catalyst, at a given reaction temperature, and reacted for a certain definite time. The vessel is free of water, die monomers are charged in a definite proportion, and any other conditions that may affect the result are held fixed. The next portion of the experiment may involve one of these conditions controlled at a new level while the others remain fixed. Proper design of experimental programmes presupposes ability to control the important factors so that the variation due to these factors can be calculated. In Chapter VI, experimental designs for various situations are coveted. 

C. Because Jy is the mean velocity, to travel 10 mm takes [10 mm/(0.l7 mm s-1)] or 59 s and to travel 1 m takes [1 m/(0.l7 x 10-3 m s-1)] or 5900 s, which is 1.6 hours, considerably less than that calculated for diffusion in A. Also note that the distance traveled in the phloem vessel is proportional to time rather than to the square root of time, as is the case for diffusion (see Eq. 1.6). 

Methanol is somewhat less reactive than its higher homologues and slow combustion takes place at a conveniently measurable rate only above 390 °C. In uncoated pyrex vessels [7], or vessels coated with boric acid or potassium chloride [8], reaction begins immediately without a true induction period and accelerates to a maximum rate. This maximum is increased by the addition of inert gas and is proportional to the square of the initial methanol concentration, (in boric acid coated vessels this power is about 2.5) but independent of oxygen concentration over a wide range of conditions. The overall activation energy (calculated from the effect of temperature on the maximum rate of pressure change) is about 40 kcal.mole" in coated vessels and about 53—61 kcal.mole in uncoated ones. 

A vessel of 60 ou ft oapacily is evacuated and thermoatated at 60° F. Five pounds of liquid propane are injected. What will be the pressure in the vessel and what will be proportions of liquid and vapor present Repeat calculations for 100 lb of propane injected. The densities of ooeHsting liquid and vapor propane at 60° F are 31.75 Ib/ou ft and 0.990 Ib/ou ft, resipectively. 

The ratio of void in wood-chip was investigated by the sand replacement method using 3,000 ml cylindrical vessel. The used sand was the standard sand for the physical testing method of cement (JIS R 5201). It is found that the ratio of void is in proportional to median diameter calculated from sieving curve as shown in Fig. 1. 

Calculations derived from microspheres with uniform size, having diameters of 20, 28, 40, and 60 pm, have indicated a similar proportion of pulmonary vessels blocked, namely 0.2-0.3%, when 1 mg of these microspheres was injected. However, when calculations were based on the same number of microspheres (i.e., 100,000), the percentage of blocked vessels increased considerably with the diameter of the microspheres (Harding et al. 1973). 

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