Uranium-235 can be separated from U-238 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 of effusion rates for 238UF6 and 235UF6. The atomic mass of U-235 is 235.054 amu and that of U-238 is 238.051 amu.

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Asked Nov 18, 2019
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Uranium-235 can be separated from U-238 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 of effusion rates for 238UF6 and 235UF6. The atomic mass of U-235 is 235.054 amu and that of U-238 is 238.051 amu.

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Expert Answer

Step 1

The ratio of the effusion rates of two gases:

Graham's Law
Rate of effusion A
Rate of effusion B VM
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Graham's Law Rate of effusion A Rate of effusion B VM

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Step 2

Calculation of molar mass of 238UF6 and 235...

Atomic Mass of 23SU is=238.02
Atomic mass of 235U is -235.04
Atomic Mass of F is=18.998
Molar mass of3UF,is=238.051 + (6) (18.998) 352.039 g/mol
Molar mass of23 UF,is=235.054 + (6) (18.998) 349.042 g/mol
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Atomic Mass of 23SU is=238.02 Atomic mass of 235U is -235.04 Atomic Mass of F is=18.998 Molar mass of3UF,is=238.051 + (6) (18.998) 352.039 g/mol Molar mass of23 UF,is=235.054 + (6) (18.998) 349.042 g/mol

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