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Question

The density of CO at 273 K and 1 atm is 1.2504 kg m3. Calculate
( a ) root mean square speed.
( b ) the average speed.
( c ) most probable speed.

A
URMS=246.5m/s,Ump=454.4m/s,Uav=403m/s
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B
URMS=493m/s,Ump=403m/s,Uav=454.4m/s
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C
URMS=403m/s,Ump=493m/s,Uav=246.5m/s
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D
None of these
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Solution

The correct option is B URMS=493m/s,Ump=403m/s,Uav=454.4m/s
(a) The RMS speed is URMS=3Pd=3×1.013×105N/m21.2504=493m/s
(b) The average speed is Uav=0.9213URMS=0.9213×493=454.4m/s
(c) The most probable speed is Ump=0.816×Urms=0.816×493=403m/s

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