Final answer:
The unit of formula mass is g/mol. hence the correct answer is option E.
Step-by-step explanation:
Formula mass is expressed in grams per mole (g/mol), representing the mass of one mole of a substance. This unit is commonly used in chemistry to quantify the mass of molecules or compounds. The formula mass is calculated by summing the atomic masses of all the atoms present in the chemical formula of a substance.
Options A, B, and C are not the standard units for formula mass:
A. particles/mol is more related to Avogadro's number and the number of particles (atoms, molecules) per mole.
B. g⋅mol is a combination of units but not the standard way of expressing formula mass.
C. amu (atomic mass unit) is a unit used for expressing atomic and molecular masses on a scale based on the mass of the carbon-12 isotope. While it's related, the standard unit is g/mol.
Option D (g/mL) is a unit of density, not formula mass.