Al quemar propano en presencia de oxígeno (O2), se obtienen dióxido de carbono y
agua. Si se queman 10 L de propano en condiciones normales, calcula:
a) Litros de oxígeno en las mismas condiciones que se consumen.
b) Gramos de agua que se forman.

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.