A mixture of ideal gases consists of 3 kg of nitrogen and 5 kg of carbon dioxide at a pressure of 3 bar and a temperature of 20°C. Find (i) the mole fraction of each constituent, (ii) the equivalent molecular weight of the mixture, (iii) the equivalent gas constant of the mixture, (iv) the partial pressures and partial volumes, (v) the volume and density of the mixture, and (vi) the c, and c, of the mixture. If the mixture is heated at constant volume to 40°C, find the changes in internal energy, enthalpy and entropy of the mixture. Find the changes in internal energy, enthalpy and entropy of the mixture if the heating is done at constant pressure. Take y : for CO, = 1.286 and N2 = 1.4. [Ans. (i) 0.485, 0.515; (ii) 36.25 kg/kg mole ; (iii) 0.229 kJ/kg K ; (iv) 1.455 bar, 1.545 bar; 0.87 m2, 0.923 m3 ; (v) 1.79 m³, 4.46 kg/m³ ; (vi) 0.92 kJ/kg K, 0.69 kJ/kg K ; 110.4 kJ, 147.2 kJ, 0.368 kJ/kg K ; 0.49 kJ/kg K]

A mixture of ideal gases consists of 3 kg of nitrogen and 5 kg of carbon dioxide at a pressure of 3 bar and a temperature of 20°C. Find (i) the mole fraction of each constituent, (ii) the equivalent molecular weight of the mixture, (iii) the equivalent gas constant of the mixture, (iv) the partial pressures and partial volumes, (v) the volume and density of the mixture, and (vi) the c, and c, of the mixture. If the mixture is heated at constant volume to 40°C, find the changes in internal energy, enthalpy and entropy of the mixture. Find the changes in internal energy, enthalpy and entropy of the mixture if the heating is done at constant pressure. Take y : for CO, = 1.286 and N2 = 1.4. [Ans. (i) 0.485, 0.515; (ii) 36.25 kg/kg mole ; (iii) 0.229 kJ/kg K ; (iv) 1.455 bar, 1.545 bar; 0.87 m2, 0.923 m3 ; (v) 1.79 m³, 4.46 kg/m³ ; (vi) 0.92 kJ/kg K, 0.69 kJ/kg K ; 110.4 kJ, 147.2 kJ, 0.368 kJ/kg K ; 0.49 kJ/kg K]

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

12. A mixture of ideal gases consists of 3 kg of nitrogen and 5 kg of carbon dioxide at a pressure of 3 bar and
a temperature of 20°C. Find (i) the mole fraction of each constituent, (ii) the equivalent molecular weight
of the mixture, (iii) the equivalent gas constant of the mixture, (iv) the partial pressures and partial
volumes, (v) the volume and density of the mixture, and (vi) the c, and c, of the mixture.
If the mixture is heated at constant volume to 40°C, find the changes in internal energy, enthalpy and
entropy of the mixture. Find the changes in internal energy, enthalpy and entropy of the mixture if the
heating is done at constant pressure.
Take y: for CO, = 1.286 and N2 = 1.4.
[Ans. (i) 0.485, 0.515 ; (ii) 36.25 kg/kg mole ; (iii) 0.229 kJ/kg K ;
(iv) 1.455 bar, 1.545 bar ; 0.87 m³, 0.923 m³ ; (v) 1.79 m³, 4.46 kg/m³ ;
(vi) 0.92 kJ/kg K, 0.69 kJ/kg K ; 110.4 kJ, 147.2 kJ, 0.368 kJ/kg K ; 0.49 kJ/kg K]

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