Asked by serena
"Calculate the internal energy for the air in human lungs after a regular inhalation. You find this volume discussed in the context of the spirometer (textbook p. 203). Hint: treat air as an ideal gas with the molecular mass M = 29.00 g/mol "
Not sure the process to solve this?
Not sure the process to solve this?
Answers
Answered by
drwls
Knowing the molecular mass is not enough for the internal energy. You need to know that it is a diatomic gas, for which the molar specific heat at constant volume (Cv) is (3/2)R
The internal energy is
U = Cv*n*T = (3/2)*n*R*T
T is the absolute temperature, 310K inside the body.
n is the number of moles in the lungs, which is PV/RT
U = (3/2)*P*V
Look up the spirometer lung volume V and use 1.01*10^5 N/m^2 (1 atm) for P
The internal energy is
U = Cv*n*T = (3/2)*n*R*T
T is the absolute temperature, 310K inside the body.
n is the number of moles in the lungs, which is PV/RT
U = (3/2)*P*V
Look up the spirometer lung volume V and use 1.01*10^5 N/m^2 (1 atm) for P
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