MOLECULAR FORMULA whole number multiple of the empirical formula

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Presentation transcript:

MOLECULAR FORMULA whole number multiple of the empirical formula need: empirical formula MM of molecular formula

MOLECULAR FORMULA What is the empirical formula of a cmpd that 27.3% C and 72.7% O?

MOLECULAR FORMULA The molecule’s MM is 132.03 g/mol. Calc. the molecular formula: 1. Find MM of the empir. formula.

MOLECULAR FORMULA The molecule’s MM is 132.03 g/mol. Calc. the molecular formula: 2. Divide molecular MM by empirical MM.

MOLECULAR FORMULA The molecule’s MM is 132.03 g/mol. Calc. the molecular formula: 3. Multiply all elements by the whole # to get the molec. formula.

Calculate molecular formulas: Molar Mass Empirical Formula Molecular Formula 60 g/mole CH4N C2H8N2 181.5 g/mol C2HCl C6H3Cl3