Chemistry
posted by Jess .
I keep calculating the square root of 3RT/M, and am not worrying about the temperature. I keep using 238 and 235 as my M when I do calculate it for both isotopes. Then I end up getting 1.00 as my final answer. That can't possibly be correct, can it?
The question was: The two isotopes of uranium, 238U and 235U, can be separated by effusion of the corresponding UF6 gases. What is the ratio (in the form of a decimal) of the rootmeansquare speed of 238UF to that of 235UF6 at constant temperature?

Chemistry 
DrBob222
I expect you are not carrying it out to enough decimal places. The ratio of 235/238 is almost 1.00 (but not quite).
The other thing is you need to include UF6 and not just U. Sine the 3*R*T will be the same, you can get by, I think with just sqrt(1/M) vs sqrt(1/M). I went through in a really big hurry and got something like 1.004 or so but you need to do it more precisely. I worked in Oak Ridge, TN for a while (where one of the gaseous diffusion plants is located) and they have many, many separation stages (because the ratio IS so close to 1.00 as you point out).
Respond to this Question
Similar Questions

chem
At what temperature will a molecule of UF6 have the same average speed as a molecule of hydrogen gas at 37 degrees C? 
Chemistry
I am having trouble in calculating equilibrium concentrations. Where I get stuck will be at the end where I have to square root both sides and get the value of x to plug in the equation to get the individual concentration of every … 
chemistry
I will like to know what I am doing wrong in calculating the energy difference when there is a transition of n=3 to n=2 for 1 mol of hydrogen atoms because I keep on getting 1.82*10^(5). Thanks 
Chemistry
Uranium235 can be separated from U238 by fluorinating the uranium to form UF6 (which is a gas) and then taking advantage of the different rates of effusion and diffusion for compounds containing the two isotopes. Calculate the ratio … 
Math
Rationalize the denominator. Assume that all expressions under radicals represent positive numbers. The square root of 3y^4 to the third root divided by the square root of 15x^4 to the third root. Here is what I have so far: I multiplied. … 
Calculus disaster
Uranium ore has two main isotopes, mostly U238 with just a trace amount of U235. In a sample of Uranium ore, 99.85% of the atoms are U238 atoms and 0.15% are U235 atoms. Before the Uranium can be used in a nuclear power plant, … 
health physics
Assuming that at the beginning of time (big bang; creation of the universe) there were equal numbers of U235 and U238 atoms produced, estimate the age of the Earth (using terrestrial U235 and U238 abundances). 
Math
I need to find the domain of f(x) = (3x+3)/ (x^2 3). I keep getting (U SQUARE Root of 3 and  Square root of 3 U ) Does that mean that the answer is all real numbers? 
Chemistry
Uranium235 can be separated from U 238 by fluorinating the uranium to form UF 6 which is a gas) and then taking advantage of the different rates of effusion and diffusion for compounds containing the two isotopes. Calculate the ratio … 
CHEMISTRY HELP !!!!
Which of the following statements is/are CORRECT?