Molecular Weight Calculator for Mac

From ZeroPace:

Molecular Weight Calculator is a Microsoft Excel workbook which can be used to calculate the molecular weights of compounds. The spreadsheet format is useful for calculating and storing frequently used molecular weights. The calculations are performed with BASIC functions which can be modified by the user. A Periodic Table worksheet is included so that the stored atomic weights can be modified by the user also. The workbook is saved in Excel 5.0 format.