Calculating the Empirical Formula of a Hydrocarbon: Step-by-Step Guide

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The sample increased in mass because the oxygen from the air combined with the carbon from the hydrocarbon to form the CO2. This information can be used to determine the empirical formula of the hydrocarbon, which is C2H10. In summary, the given information allows us to determine that the empirical formula of the hydrocarbon is C2H10.
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darthxepher
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Homework Statement



A whole class of compounds is composed of just carbon and hydrogen, the "hydrocarbons". If a 7.81 g sample of a hydrocarbon was analyzed and the carbon was converted to 26.4g of CO2 what is the empirical formula?

Homework Equations



No clue what converted means... and how a part of the sample increases in mass...

The Attempt at a Solution




Choices

a) CH b)CH10 c)C2H10 d)C10H e)C10H2
 
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  • #2
I see your confusion.

7.81 g of hydrocarbon was burnt in exess oxygen, 26.4 g of CO2 were produced.

--
methods
 
  • #3
"Converted" means the hydrocarbon reacted with oxygen at a high temperature, and the carbon was all burned to carbon dioxide.
 

Related to Calculating the Empirical Formula of a Hydrocarbon: Step-by-Step Guide

What is a hydrocarbon?

A hydrocarbon is a molecule that is made up of only hydrogen and carbon atoms. It is a type of organic compound and is the main component of fossil fuels such as gasoline, natural gas, and petroleum.

What is the empirical formula of a hydrocarbon?

The empirical formula of a hydrocarbon is the simplest ratio of atoms in a molecule. It shows the relative number of each type of atom present in the compound. For hydrocarbons, the empirical formula will always be some multiple of the ratio CH.

How do you calculate the empirical formula of a hydrocarbon?

To calculate the empirical formula of a hydrocarbon, you need to know the mass of each element present in the compound. Then, you can convert these masses into moles and divide them by the smallest number of moles to get the ratio of atoms. This ratio will give you the empirical formula.

Why is it important to know the empirical formula of a hydrocarbon?

Knowing the empirical formula of a hydrocarbon is important because it can help identify the type of hydrocarbon and its properties. It can also be used to determine the molecular formula, which gives the exact number of each type of atom in a molecule.

What are some common ways to represent the empirical formula of a hydrocarbon?

The empirical formula of a hydrocarbon can be represented in different ways, such as a chemical formula (e.g. CH4), a molecular model, or a structural formula. It can also be written in a simplified form, such as CxHy.

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