What are the number of ions Fe^+2 and Fe^+3 in Fe7(CN)18?

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

What is the percent by mass of oxygen in fe2o3