Question

A certain protein was found to contain 0.152% cobalt by mass. Determine the minimum molecular mass of the protein

Answer 1

Thanks for the question.
I may help you in finding the answer.
As the manganese present is = 0.412%
that's mean 100 g of protein contain 0.412 g  of Mn.
Molar mass of manganese is = 54.938 u 
So in 100 g we will have 0.412/54.938 moles of manganese=  0.007 moles of Mn.
 so in total 100 g of protein we will have mass
1 mole = 100/0.007 =14285 g/mol for that is the molar mass for 100 g of protein..
This may help you .