How do you do empirical and molecular formulas?
like: 0.638 mole Ba(CN)2 to grams?
The molar mass of barium * .638the molar mass of carbon * .638 * 2the molar mass of nitrogen * .638 * 2Add them all up, and that is the mass in grams.
If you have a problem solving for the empirical and molecular formula, check out some pointers on www.chem.tamu.edu/class/majors/tutorialnotefiles/empirical.htm. You should also talk to your chemistry teacher because some things might need some explaining to understand.