determining the molar mass of a Problem #2 - calculate how many moles are in 170 grams of h 2 o 2 170 grams are given in the text of the problem the molar mass is 340146 grams/mole, which is calculated using the.
{"Image DocumentName": "Determining a Molecular Formula from Elemental Analysis and Molar Mass", "Image ImageDescription": "Sample Problem PROBLEM: Elemental analysis of lactic acid (M = g/mol) shows it contains 40.0 mass % C, 6.71 mass % H, and 53.3 mass % O. Determine the empirical formula and the molecular formula for lactic acid. PLAN: assume 100 g lactic acid; then mass % = mass in grams. amount (mol) of each element. divide each mass by M. empirical formula. use # mols as subscripts; convert to integers. molecular formula. divide M by the molar mass for the empirical formula; multiply empirical formula by this number.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}