Given the balanced equation below, calculate the mass of methane (CH4) at STP required to react with 20.0 g of magnesium carbide. Mg2C(s) + 4 H2O(g) --> 2 Mg(OH)2(s) + CH4(g)

Answer is in the file below

is.gd/qKzpBU

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.