Enter the compound and its mass after combustion a compound (Remember to add reactant mass too)

Put an element in target only if the compound has more than 2 elements. eg 'N' to find nitrogen in 'HNO3'

Use the add row buttons to add more elements, and calculate to show to empirical formula and molar mass

If there is oxygen in the compound, add O for the compound, and the mass of oxygen produced from combustion