Solve for the unknown by showing your work. 1) Find the volume of 28 g CO2 at STP?

2) Using your answer in #1, determine the density of carbon dioxide.

3) In the combustion reaction of methane gas : CH4 (g) + O2 (g) --> CO2 (g) + 2 H2O (g)

4.0 X 10 exp 23 molecules of CH4 was used. Determine

(a) the moles of CO2 produced

(b) using your answer in (a), calculate the volume of CO2 produced at STP

(c) the volume of oxygen used in the reaction at STP

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.