# MET 260 Lecture Notes - Lecture 17: Molar Mass, Chemical Formula, Sodium Chloride

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## Document Summary

Mass percent of element of element x= (mass of x in a sample of the copound/ mass of the sample of the compound) x 100. A . 358g sample of chromium reacts with oxygen to form . 523g of metal oxide. Cr(metal)- element metal oxide (contains cr and o) - compound. Now plug in the numbers exactly as given. Using mass percent composition as a conversion factor: We can use mass percent composition as a conversion facto between grams of a constituent element and grams of the compound! The mass percent composition of sodium (na) in sodium chloride (nacl) is 39% 39g na/ 100g nacl or 100g nacl/39g na these are the conversion factors you will need to solve the problems. These fractions are conversion factors between g na (constituent elemt) and g. Chloride (nacl) is 39% sodium (na) by mass. The fda recommends that adults consume less than 2. 4g of sodium per day. 6. 7 mass percent compostion from a chemical formula: