A certain protein was found to contain 0.870% Cobalt by mass. Determine the minimum molecular mass of the protein (in amu)

Question

anonymous · Answer

@Callisto @shadowfiend @AccessDenied @ganeshie8

aaronq · Answer

0.0087 x 58.93 g/mol = 0.5126 g/mol 

idk this is the only thing i can think of

anonymous · Answer

Well, obviously it's got to contain at least one cobalt atom, right?  And one cobalt atom weighs 58.9332 g/mol.  So if that represents 0.870% of the total mass of the protein, the latter would be 58.9332/0.00870 = 6.774 x 10^3 g/mol.

anonymous · Answer

Bah, sorry.  I typed one more digit than is significant: 6.77 x 10^3 g/mol, or 6.77 kDa.

aaronq · Answer

one mole of cobalt atoms weighs 58.93 not one atom.