Kinetic Molecular Theory Quiz

1
Kinetic Molecular Theory Quiz 2 a. On the
following plot of the distribution of molecular
speeds for N2 at 25 ?C, indicate clearly the
relative positions of the most probable speed,
the mean speed, and the root mean squared speed
2
b. On the following plot of the distribution of
molecular speeds for N2 at 25 ?C, indicate how
the distribution for SF6 at 25 ?C would look
clearly indicating the relative position of the
maximum and the relative amplitude of the
distribution
3
c. On the following plot of the distribution of
molecular speeds for N2 at 25 ?C, indicate how
the distribution for N2 at 600 ?C would look
clearly indicating the relative position of the
maximum and the relative amplitude of the
distribution
4
d. On the following plot of the distribution of
molecular speeds for N2 at 25 ?C, indicate how
the distribution for SF6 at 100 ?C would look
clearly indicating the relative position of the
maximum and the relative amplitude of the
distribution
Notice that in the Maxwell distribution of
molecular speeds
Pc dNc / N 4 p M / 2 p R T 3/2 c2 e- M c2
/ 2 R T dc
the molar mass and temperature always occur as a
ratio, M / T, thus it is the value of this ratio
that governs the distribution and ( M / T
)SF6 146.08 g/mol / 600.0 K 0.2435 g / mol K
gt ( M / T )N2 28.02 g/mol / 298.2 K
0.09396 g / mol K