The calculator uses two field types -
These fields appear on the screen as you would see an empirical formula written. e.g.
The above information would be entered if you were calculating %CHN values for 4-chlorobenzoic acid.
If you have elements other than C,H and N present, you can enter their symbols into the empty element symbol boxes, and the quantity of these elements in the empty element quantity boxes. When you have finished entering your required formula, click on the Click here to check results button to finalise the calculation and recheck your results.
Your theortical results are updated whenever you change one of the fields (i.e. when you enter a new value and move to the next field, or when you click on the 'Check' button).
Points to note
Although Ethanol, for example, has the formula CH3CH2OH, or C2H6O , when entering on the %CHN calculator, you must enter C2H6N0O1.
Please contact Dr Brian Hutton for further information.