Question

define:atomic mass,molecular mass, mole concept.

Answer 1

Molecular mass or molecular weight is the mass of a molecule. It is calculated as the sum of the atomicmass of each constituent atom multiplied by the number of atoms of that element in the molecular formula. The molecular mass of small to medium size molecules, measured bymass spectrometry, determines stoichiometry.

Answer 2

mass of any atom are called atomic mass.
mass of molecules are called molecular mass.
mole can be defined in various ways
1. mole in term of mass
2 mole in term of numbers
3 mole in term of volume.