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#### eddystone

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##### Empirical formula?? Help me please!!!!
« on: August 12, 2004, 12:51:17 AM »
Hi all,

Does anyone know how to do this??

When 2.3g of a compound containing only carbon, oxygen and hydrogen is combusted it produces 4.4g of CO2 and 2.7g of H2O.

What is the empirical forumula of this compound??

Thanks heaps
eddy

#### Donaldson Tan

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##### Re:Empirical formula?? Help me please!!!!
« Reply #1 on: August 12, 2004, 02:45:37 AM »
All the carbon in carbon dioxide and hydrogen in water comes from the organic compound. The rest of the mass not accounted by carbon dioxide and water is the oxygen mass in the compound.

"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

#### thallium chick

• Guest
##### Re:Empirical formula?? Help me please!!!!
« Reply #2 on: August 18, 2004, 12:47:05 PM »
an empirical formula is the simplest ration of atoms present in a molecule. so follow the steps:

1.  Convert the mass of each element to moles of each element using the atomic masses.

2. Find the ratio of the moles of each element by dividing the number of moles of each by the smallest number of moles.

3. Use the mole ratio to write the empirical formula.

helped?