Molecular mass spreadsheet

A. G3 This problem can be worked with Equations 19-6 on a calculator or with the spreadsheet in Figure 19-5. Transferrin is the iron-transport protein found in blood. It has a molecular mass of 81 000 and carries two FeJ+ ions. Desferrioxamine B is a chelator... 

From the way in which you designed the spreadsheet, the atomic masses are listed in column C in order of increasing atomic number. Thus, Cl contains the atomic mass of H, C6, that of C, and so forth. If you start to remember the atomic numbers of most of the elements, say, A1 is 13, then obviously you recognize that its atomic mass value is in cell C13. The calculation of the molecular mass of NaCl can be obtained Ifom the formula +C11 + C17. 

Before the raw data can be fitted to a thermodynamic model it must first be converted into mass or mole fractions. This operation can be accomplished quickly using a Microsoft Excel spreadsheet that is linked to the Aspen. aprbkp file in order to obtain the solvent molecular weights and temperature dependent densities. The molar volume of Form A Cimetidine is also required for this conversion, however, as is often the case it was not available so a density of 1 g/ml has been assumed. 

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