For the equilibrium reaction: no2-n2o4
a) what conditions of pressure and temperature will full dissocation occur?
b) calculate the partial pressure of no2 at 100 degrees celcius (assuming n2o4 is completely dissociated). (ink=
c) show that kp=kc/rt for the equilibrium reaction: kp= p•[n2o4]/[no2]^2•rt
if they behave as gases, ideally.

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.  

it is reliable if two scientists recorded it