What is the percent composition by mass of oxygen in magnesium oxide?

1 Answer
Nov 5, 2016

Answer:

#"Percentage oxygen composition in magnesium oxide"~=40%#.

Explanation:

#"Percentage oxygen composition in magnesium oxide "=#

#"Mass of oxygen"/"Mass of oxygen + mass of magnesium"xx100%#

#=# #(15.999*cancel(g*mol^-1))/(15.999*cancel(g*mol^-1)+24.305*cancel(g*mol^-1))xx100%=??#