Proposed Problems Ideal Gases

Given thatX is positive, the assumption that N2 will pass from compartment I to compartment II is correct. 

Unknown element [2]. There is an element that, under the conditions of the experiment, can be considered an ideal gas. When 84 g of the element are placed in a cylinder of volume +, the product of R X R is 1/3 Rx V. What is the element  

Unknown compound [3]. 98.28 g of a compound occupies a volume of 50 L in normal conditions. What could the compound be  

Normal conditions [2]. One modification that has been proposed for the equation of state of an ideal gas is PV = nRTZ, where Z represents a correction factor. This correction factor is mainly affected by the pressure and temperature, i.e., Z = Z(R,T). Check that for an ideal gas, Z = 1. Remember, in normal conditions, 1 mol of gas occupies a volume of 22.4 L at 1 atm and 273.15 K. 

Piston [4]. CO2 is stored in a cylinder-piston system (diameter = 2.000 m, height = 3.000 m) at 25 °C. If the piston has a mass of 100 kg and the system is under equilibrium, what is the pressure of the gas inside the cylinder  

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No satisfactory relationship of this type is known for liquids and solids, but for gaseous systems certain moderately simple equations of state have been proposed. AH gases actually differ in their behavior, and so the problem is approached by postulating the properties of an ideal gas, and then considering deviations from ideal behavior. 

A stream of hydrofluoric acid (1) in water (2) at 120°C and 200 kPa contains 12% mole hydrofluoric acid (HF). It is proposed to concentrate the HF in solution by partial vaporization in a single stage, by means of temperature and pressure control. Calculate the resulting liquid composition and the fraction vaporized at 120°C and 135 kPa. Can this process be used to concentrate the liquid for any starting composition Use the van Laar equation for liquid activity coefficients and assume ideal gas behavior in the vapor phase. The vapor pressures of HF and water at 120°C are 1693 and 207 kPa, respectively, and the van Laar constants are Ajj = -6.0983, A2] = -6.9658 (see Problems 1.8 and 1.9). 

As stated at the beginning, all the concepts required in the solved- and proposed-problem sections were learned (or should have been learned) in high school. Assuming that it is necessary to review certain concepts, we will take the opportunity to do an exhaustive review in the solved-problem section. Some of the concepts to be reviewed include, for example, ideal gas mixtures, Dalton s law, and Amagat s law. But we will also keep it simple the focus will be, as in previous chapters, on tackling problem formulation ... 

Pyzhov Equation. Temkin is also known for the theory of complex steady-state reactions. His model of the surface electronic gas related to the nature of adlay-ers presents one of the earliest attempts to go from physical chemistry to chemical physics. A number of these findings were introduced to electrochemistry, often in close cooperation with -> Frumkin. In particular, Temkin clarified a problem of the -> activation energy of the electrode process, and introduced the notions of ideal and real activation energies. His studies of gas ionization reactions on partly submerged electrodes are important for the theory of -> fuel cell processes. Temkin is also known for his activities in chemical -> thermodynamics. He proposed the technique to calculate the -> activities of the perfect solution components and worked out the approach to computing the -> equilibrium constants of chemical reactions (named Temkin-Swartsman method). 

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