Since the mass (m) of a sphere is proportional to the radius cubed, r 3 ,...
Since the mass (m) of a sphere is proportional to the radius cubed, r 3 , show that D is proportional to m(−1/3). If a spherical protein oligomerizes and is still approximated by a sphere, by what factor would its MW have to increase to result in a diffusion coefficient that decreases by 1/2?
Homework Answers
Molecular weight of a spherical molecule is defined by following formula.
Where M = molecular weigh
r = radius of sphere
= density of sphere molecule
Diffusivity of sphere molecule is defined by following formula.
Where D = Diffusivity in cm2/sec.
Now simplifying formula of diffusivity to convert in terms of molecular weight
Now if D2=D1/2 what will be M2?
So if Diffusivity will be half molecular weight will increase 8 times of initial value.
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Since the mass (m) of a sphere is proportional to the radius
cubed, r 3 ,...
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A solid copper sphere of mass M and radius R
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AP Physics C FRQ
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