Question 3 9 pts A gas has a specific heat at constant pressure of c-0.490 Btu/lb Btu/lbm. R. Det...
3. Air is heated from 5400 R to 12000 R while the pressure drops from 50 lbf/in2 to 40 lbf/in2, assuming constant specific heat (Cp 0.24 Btu/lbm-R) and R 53.33 Btu/lbm-R (a) Determine the change of entropy per pound of air (b) If the air was cooled from 1200° R to 540° R while the pressure drops from 50 lbf/in2 to 40lbf/in2 what does it say about the system entropy? Does the result violate the entropy increase principle? 3. Air...
A constant specific heat ideal gas has a gas constant of 42.92 ft·lbf/(lbm·R) and a constant pressure specific heat of 0.200 Btu/(lbm·R). Determine the heat transferred and the change of total entropy if 9.00 lbm of this gas is heated from 40.0 °F to 340 °F in a rigid container.
The specific heat at constant pressure (Ep) of H2 at a temperature of 2000 F has a value of 32 (Btu/lbm mole R). What will be the value of K, where K cp/cy. Do not use graphs in the book. Assume ideal gas.
2) A mixture of 4 lbm of CO2 and 3 lbm of N2 is stored in a tank with a volume of 5 ft3. The temperature of the mixture is maintained at 80°F. Evaluate: (a) the total pressure of the mixture, (b) the mole fraction of both the gases, (c) the molecular weight of the mixture, and (d) the apparent specific gas constant of the mixture. (30 pts.) A mixture of 4 lbm of CO2 and 3 lbm of N2...
The molar specific heat of diatomic gas at constant pressure is approximately given by 7/2 R(J / mol·K). What is the heat capacity of 1kg of N2 gas? Take the molecular mass of N2 atom as 28. (a) 1040 J/K (b) 370 J/K (c) 280 J/K (d) 252 J/K (e) 100 J/K
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is pv1.1 = constant. The mass of the gas is 0.4 lb and the following data are known: p1 = 160 lbf/in.2, V1 = 1 ft3, and p2 = 390 lbf/in.2 During the process, heat transfer from the gas is 2.1 Btu. Kinetic and potential energy effects are negligible. Determine the change in specific internal energy of the gas, in Btu/lb.
A vertical piston-cylinder contains 1.5 lbm of air. The piston has a mass of 6 Ibm and a face area of 10 in2. The air initially occupies a volume of 30.6 in3 and has a specific internal energy of 225 BTU/lbm. The atmosphere exerts a pressure of 1 atm on the top of the piston. Heat transfer occurs slowly during the process between the air in the piston and the surroundings, and the volume of the air decreases to 15.0...
4. An ideal gas with constant specific heats undergoes a process from an initial pressure of 50 kPa and initial specific volume of 4 m^3/kg to a final pressure of 80 kPa and final specific volume of 5 m^3/kg. The mass of the carbon monoxide is 3 kg. The gas has a molar mass of 44 kg/kmol and a specific heat at constant volume of 0.98 kJ/(kg∙K). Determine the entropy change of the gas during the process in kJ/K.
1-4): You may find the following helpful for problems 1- R 8.314 N-m/( 1 J = 1 N-m. mole-K) or 1545 ft-lbf/(mole-R); 9e-32.17 lbm-ft/(lb-sec?); go 1 in SI units RF + or 28 lbm/mole; 1 bar 460 K + 273: 778 ft-lbr 1 Btu; MW of Nitrogen - 100,000 N/m2 1. (30 pts) A piston-cylinder arrangement forces 3 lbm of ideal gas N2 at 14.7 psia and T 80 °F to P2 36 psia in a quasi equlioiu where the...
need help asap please Question 19 (1 point) The specific heat at constant pressure at 0°C of one mole of an ideal diatomic gas is R. (3/2) (1/2) O (7/2) (5/2)