Hi, what do you want to do?
National Institute of Open Schooling
Chemical Arithmetics
Substances with the same empirical and molecular formula must be differentiated by their structural formula. Part two in a series of 36 has pupils using chemical formulas to calculate how much of a compound is present in a given...
University of Waterloo (Canada)
University of Waterloo: Excess and Limiting Reagents
Very good site which gives an explanation, example and skill building questions over limiting reagents.