Question

what is the empirical formula mass of a compound?
it is the sum of the masses of all atoms found in the simplest whole - number ratio of each atom type found in a compound.
it is the same concept that the relative molecular mass of the compound.
it is the same concept that the molar mass of the compound
it is the mass of one molecula of the compound measured in kg.

Explanation:

The empirical formula mass is calculated by summing the atomic masses of atoms in the simplest whole - number ratio (empirical formula). The relative molecular mass is for the molecular formula (which may be a multiple of the empirical formula). Molar mass has units of g/mol (not just mass). Mass of one molecule in kg is not relevant to empirical formula mass.

Answer:

It is the sum of the masses of all atoms found in the simplest whole - number ratio of each atom type found in a compound.