ME 501 Thermodynamic Properties and Population Distributions for Diatomic Molecules Example Problem One (1.0) kmol of gaseous HF is contained in a rigid tank at pressure of 0.1 Pa at a temperature of 10 K (state 1). The temperature of the tank is raised to 30 K (state 2) by heat transfer. The pressure is low enough that the HF exhibits ideal gas behavior. Assume that the translational mode is fully excited at both the initial and final states. (a) Assuming that HF is a rigid-rotator, calculate the internal energy change U2– U1(in J) for the constant volume heating process.
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