Page 79 - DJJ20063- Thermodynamics 1

DJJ20063- Thermodynamics 1

Activity 2F

TEST YOUR UNDERSTANDING BEFORE YOU CONTINUE WITH THE NEXT INPUT…!

2.14 Two kilograms of a gas receive 200 kJ as heat at constant volume process. If the

o
temperature of the gas increases by 100 C, determine the Cv of the process.

o
2.15 A perfect gas is contained in a rigid vessel at 3 bar and 315 C. The gas is then
cooled until the pressure falls to 1.5 bar. Calculate the heat rejected per kg of gas.
Given:

M = 26 kg/kmol and  = 1.26.

o
3
2.16 A mass of 0.18 kg gas is at a temperature of 15 C, volume 0.17 m and pressure
2
130 kN/m . If the gas has a value of Cv = 720 J/kg K, calculate the:

i) gas constant

ii) molecular weight
iii) specific heat at constant pressure

iv) specific heat ratio

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