Repeatedly calls Template:Atomic mass to determine the molar mass. Maximum of 8 elements.
((Molar mass|Fe|2|Si|1|O|4))
= 203.771((Mm|Fe|2|Si|1|O|4))
= 203.771((Molecular mass|Fe|2|Si|1|O|4))
= 203.771((Molar mass | Fe | 2 | ((Molar mass|S|1|O|4)) | 3))
= 399.858