An equilibrium mixture of pcl5(g), pcl3(g), and cl2(g) has partial pressures of 217.0 torr, 13.2 torr, and 13.2 torr, respectively. a quantity of cl2(g) is injected into the mixture, and the total pressure jumps to 263.0 torr (at the moment of mixing). the system then re-equilibrates. the appropriate chemical equation is pcl3(g)+cl2(g) < --> pcl5(g) calculate the new partial pressures after equilibrium is reestablished in torr

50.23 i believe is correct but don't quote me on that.

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.