M = 81.50g, mm = m/n
n = ???
PV = nRT --> n = PV/RT
n = (1.75)(4.92)/(.0821)(307)
n = 8.61/25.20 = .342
--> mm = m/n = 81.5/.342 = 238.58
The substance is an element off of the periodic table.
Fats are large molecules made of two types of molecules, glycerol and some type of fatty acid.