11 - Determining Molecular formula Convert to moles Use...

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Empirical formula- the simplest formula with the correct ratio of atoms Molecular formula – the formula with the actual number of atoms in the molecule; MF are integer multiples of EFs; integer multiple of EF (EF) n = MF you need to know molar mass to calculate MF; otherwise stuck at EF. No molecular formula for ionic compounds; theyre not compounds Ionic formulas are empirical formulas since salts have infinitely repeating structures and not individual molecules Determining empirical formula: Assume 100 grams Convert to moles Divide by least number of moles Combustion analysis = burning the compound in oxygen Used to calculate or determine mass percent Forms water Oxygen is measured indirectly
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Unformatted text preview: Determining Molecular formula: Convert to moles Use mole ratio within compound Convert moles to grams to solve for mass of oxygen (have to find indirectly through original mass of compound) Convert back to moles Divide by smallest mole Balanced reaction gives us: • Reactants (or reagents) • Products • Physical states • Number of molecules or atoms • Moles (reactant atoms) = moles (product atoms); law of conservation of matter • g (reactants) = g (products) formula of the compounds must never be changed, only the amount of each compound balancing equations is trial and error; best way to start is to look at the most complicated molecules...
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