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Problems and Solutions - E-Courses

Problems and Solutions - E-Courses

Problems and Solutions -

Basic Thermodynamics Prof. K.Srinivasan Problems with solutions: 1. A 1-m 3 tank is filled with a gas at room temperature 20 ° C and pressure 100 Kpa. How much mass is there if the gas is a) Air b) Neon, or c) Propane? Given: T=273K; P=100KPa; Mair=29; Mneon=20; Mpropane=44; m Indian Institute of Science Bangalore = m air m neon m propane P R = × V × M × T × 1 × 29 8314 × 293 10 5 20 = × 1. 19 = 0. 82Kg 29 44 = × 0. 82= 1. 806K g 20 = 1 . 19 Kg 2. A cylinder has a thick piston initially held by a pin as shown in fig below. The cylinder contains carbon dioxide at 200 Kpa and ambient temperature of 290 k. the metal piston has a density of 8000 Kg/m 3 and the atmospheric pressure is 101 Kpa. The pin is now removed, allowing the piston to move and after a while the gas returns to ambient temperature. Is the piston against the stops? Schematic:

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