This program is an Excel (MicroSoft Office Product) AddIn and Developed by M.Subramanian
After adding this AddIn (MolWt-msubbu.xla) through Tools -> Add-Ins section of Excel, you will see the following functions available under the 'user defined ' section.
You Can make use of these functions for your calculations.
ATOMICWEIGHT("Ca") will give the result 40.08. ATOMICWEIGHT(20) or ATOMICWEIGHT("20") will also give the same result.
MOLECULARWEIGHT("Ca(OH)2") will give the result
74.095. You can enter molecular formulas of the form
or any Valid Forms, and get the MolecularWeight.