What is the percent composition of each element in Fe (Cr202)3?

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

What is the mass of each element in a 324.8 sample of co2