Graham's law, kinetic theory of gases.
Right on!
I did some further reading on these and I believe I can conclude that the average speed of gas molecules is inversely proportional to the square root of the molar mass. To find the fastest, find the one with the smallest molar mass.
Therefore:
Molar masses:
C2H6 = 30.068
C2H6O = 46.068
SiHF3 = 86.098
CH2F2 = 52.026
Therefore for (a) I can conclude that C2H6 will diffuse the fastest, correct?
And for (b)...
C2H6 = u=sqrt(3*R*T/M)
= sqrt(3 * 8.314 * 298 / 0.030068)
= 497.1889853
C2H6O = u=sqrt(3*R*T/M)
= sqrt(3 * 8.314 * 298 / 0.046068)
= 401.6743415
SiHF3 =
sqrt(3 * 8.314 * 298 /0.086098)
= 293.817215
CH2F2 =
sqrt(3 * 8.314 * 298 /0.086098)
= 377.9754138
Therefore SiHF3 is the slowest, did I do this correctly?