A 12.37 gram sample of iron is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of 25.00 g. Determine the empirical formula of the metal fluoride.

Why do cells appear different in distilled water than they do in 10% salt water?

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

Reacting masses1 calcium carbonate breaks down on heating to produce calcium oxide and carbondioxide gas.caco3 + cao + co2a student heats 15 g of calcium carbonate strongly in a crucible.relative atomic masses (a): ca = 40, c = 12, o = 16.calculate the mass of calcium oxide produced by this reaction.(5 marks)