X-Y Calculation in Chemistry is borne out of the necessity to introduce young intellects into been solution provider rather problem creators. By using the Problem solving mode (PSM) technique employed in this book, young lads are brain prepared to learn different topics in chemistry by simply going through the solved problems and attempting the subsequent evaluations that follows. With the mode employed in this book, science oriented kids are able to note the discrepancy that exist between theoretically predicted values and practical obtained data from the lab.