ThermodynamicsMedium
Question
The molar heat capacity at constant presure of nitrogen gas at STP is nearly 3.5 R. Now when the temperature is increased, it gradually increases and approaches 4.5 R. The most appropriate reason for this behaviour is that at high temperatures
Options
A.The molar heat capacity at constant presure of nitrogen gas at STP is nearly 3.5 R. Now when the temperature is increased, it gradually increases and approaches 4.5 R. The most appropriate reason for this behaviour is that at high temperatures
B.nitrogen molecules dissociate in atoms
C.the molecules collides more frequently
D.molecular vibration gradually become effective
Solution
(D)
CP = 3.5 R (At STP)
As temperature increases, vibrational degree of freedom becomes 2 at higher temperature.
CP = 8/2 R = 4.5 R
CP = 3.5 R (At STP)
As temperature increases, vibrational degree of freedom becomes 2 at higher temperature.
CP = 8/2 R = 4.5 R
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