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## PowerPoint Slideshow about 'MOLECULAR FORMULAS' - zocha

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- Empirical Formulas –
- Simplest whole number ratio of atoms in a compound

- Molecular formula –
- A chemical formula that shows the actual number and kinds of atoms present in a compound

- Which pair of molecules has the same empirical formula
- A) C2H4O2 C6H12O6
or

- B) NaCrO4 Na2Cr2O7

Find the molecular formula for each of the following compounds given its empirical formula and molar mass

- ethylene glycol (CH3O), used in antifreeze, molar mass of 62g/mol
- P-dichlorobenzene (C3H2Cl), mothballs, molar mass of 147g/mol.

- You find that 7.36 g of a compound has decomposed to give 6.93 g of oxygen. The only other element in the compound is hydrogen. If the molar mass is 34.0g.mol, what is the molecular formula?

- The compound methyl butanoate smells like apples. Its percent composition is 58.8% C, 9.8% H and 31.4 % oxygen. Methyl butanoate’s molar mass is 102 g/mol, what is the molecular formula?

- Determine the molecular formula for the following compound percent composition is 58.8% C, 9.8% H and 31.4 % oxygen. Methyl butanoate’s molar mass is 102 g/mol, what is the molecular formula?
40.0% C, 6.6% H and 53.4% O

molar mass =120g/mol

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