Analysis of a carbon hydrogen compound was found to be 55.2 % carbon, 8.1 % hydrogen, and the rest was oxygen. The molar mass of this compound is approximately 355 g/mole. Determine the molecular formula of this compound.

the answer is d.) potassium

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.