Chapter 6, Problem 6.120EP

One mole of gas undergoes the cycle shown in the p-V diagram below. A Po B 1. D Po/32 Vo 2Vo 8V Volume 16V. (a) Classify each process in this cycle: A-B, B-C, C-D, and D-A. (b) Find y for this gas. (c) What type of gas is this, monatomic, diatomic, or polyatomic? Pressure

1. Methane gas (CH4) behaves like an ideal gas with y = 1.306. Determine the molar heat capacity at constant volume, C, and the molar heat capacity at constant pressure, Cp.

Given information is attached. A. Estimate the temperature of the saturated steam at 15.0 bar. (In degrees Celsius) B. Estimate the temperature of the superheated steam at 20.0 bar.

Find the missing properties and give the phase of the substance. (a) H2O s = 1.75 Btu/lbm R, P = 4 lbf/in.2 h = ? T = ? x = ? (b) H2O u = 1350 Btu/lbm, P = 1500 lbf/in.2 T = ? x = ? s = ? (c) R-134a T = 30 F, P = 35 lbf/in.2, s = ? x = ? (d) R-134a T =10 F, x = 0.45 v = ? s = ? (e) NH3 T = 60 F, s = 1.35 Btu/lbm R u = ? x = ? Provide details with explanations of your work. Use appropriate property diagram(s) to assist in the understanding and solution of the problems. Summarize your results in a clearly annotated and labelled Table of Results.

NOTE: Complete solution and show the derivation/cancellation of units. A steel flask of 0.04 m capacity is used to store Nitrogen at 120 bar and 20°C. The flask is protected against excessive pressure by a fusible plug which will melt and allow the gas to escape if the temperature is too high. A. How many kilogram of Nitrogen will the flask hold at the design conditions? B. At what temperature in °C must fusible plug melt in order to limit the pressure of flask to a maximum of 150 bar?

3.40 Give the phase and the missing property of P, T, v, and x. а. R-134a, T — -20°С, Р %3D 150 kPa b. R-134a, P — 300 kРа, v 3 0.072 m/kg c. CH4, T= 155 K, v = 0.04 m/kg d. CH4, T = 350 K, v = 0.25 m/kg 3.41 A sealed rigid vessel has volume of 1 m' and con- tains 2 kg of water at 100°C. The vessel is now heated. If a safety pressure valve is installed, at what pressure should the valve be set to have a maximum temperature of 200°C? 3.42 Saturated liquid water at 60°C is put under pressure /to decrease the volume by 1% while keeping the temperature constant. To what pressure should it be compressed? 3.43 Saturated water vapor at 200 kPa is in a cons ww. pressure piston/cylinder assembly. At this state the piston is 0.1 m from the cylinder bottom. How much is this distance if the temperature is changed to a. 200°C b. 100°C. 3.44 You want a pot of water to boil at 105°C. How heavy a lid should you put on the 15-cm-diameter pot when P, 101 kPa? atm

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Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 142 L of air at 2,767.92 kPa, 93.330C. Vessel B, of unknown volume, contains air at 68.95 kPa, 4.440C. The valve is opened and, when the properties have been determined, it is found that pm = 1378.96 kPa, tm = 43.330C. What is the volume of vessel B?

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