0.870% Cobalt by mass can be written as a ratio: 0.870 amu Co : 100.000 amu (total protein) Therefore, 55.85 amu Co = (100.000 amu total protein) / (0.870 amu Co) = 698881.25 amu
rounded to 3 significant figures : We get, 69,900 amu
0.870% Cobalt Ratio of cobalt can be written as: 0.870 amu Co : 100.000 amu (total protein) Therefore, 58.6 amu Co = (100.000 amu total protein) / (0.870 amu Co) = 698881.25 amu rounded the figure , we get 69999 amu