A sample of HBr is introduced at one end of a 1-meter tube. A sample of...
A sample of HBr is introduced at one end of a 1-meter tube. A sample of gas with a molecular weight of 80.9 is introduced at the other. Use Graham's law to calculate where (how many meters from the HBr end) the two gases meet.
Homework Answers
distnace travelled by HBr = x meters
unknown gas distnace travelled = 1 - x meters
rate of diffusion inversely proportional to square root of molar mass
R1 / R2 = sqrt (M2 / M1)
R1 / R2 = sqrt (80.9 / 80.9) = 1
R1 = R2
rate of diffusion is equal to distance travelled by time
r / t = r/ t
x = x -1
2 x = 1
x = 1/2
distnace travelled by HBr = 1/2 m
unknown gas distnace travelled = 1 - x = 1/2 m
they will meet at 1/5 meter of tube (half distance)
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