Chemistry, asked by modupeT, 4 months ago

a compound contains only carbon and hydrogen a combustion analysis apparatus and 3.14g of co2 and 1.2g of h2o are produce. what is the emperical formula? ​

Answers

Answered by s02371joshuaprince47
0

Answer:

Explanation:

The key here is to realize that you're dealing with a hydrocarbon, that is, a compound that contains only carbon and hydrogen.

Notice that the products of this combustion reaction are carbon dioxide,  

CO

2

, and water,  

H

2

O

.

This tells you that all the carbon that was initially a part of the hydrocarbon will now be part of the carbon dioxide. Likewise, all the hydrogen that was initially a part of the hydrocarbon is now a part of the water.

This means that you can use the number of moles of water and carbon dioxide, respectively, to determine how many moles of carbon and of hydrogen were originally present in the hdyrocarbon.

So, for water you have

14.20

g

1 mole H

2

O

18.015

g

=

0.78823 moles H

2

O

and for carbon dioxide

34.71

g

1 mole CO

2

44.01

g

=

0.78868 moles CO

2

Now, you know that every mole of water contains 2 moles of hydrogen and 1 mole of oxygen, which means that the reaction produced

0.78823

moles H

2

O

2 moles H

1

mole H

2

O

=

1.5765 moles H

SInce every mole of carbon dioxide contains 1 mole of carbon and 2 moles of oxygen, it follows that the reaction also produced

0.78868

moles CO

2

1 mole C

1

mole CO

2

=

0.78868 moles C

Finally, to find the mole ratio that exists between carbon and hydrogen in the hydrocarbon, divide these values by the smallest one

For C:  

0.78868

moles

0.78868

moles

=

1

For H:  

1.5765

moles

0.78868

moles

=

1.999

2

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