4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) The reaction above uses 824 g NH3 and excess oxygen to produce its products. a. How many moles of NO are formed? b. How many moles of H2O are formed?

c.

explanation:

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.