Question #16993

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TreeReader
Dec 10, 2017

"CH"_3"CHO" +5/2"O"_2 ->2"H"_2"O" + 2"CO"_2

Explanation:

Because it's a combustion reaction, there must be oxygen reacting with the acetaldehyde ("O"_2).

Then it forms water and carbon dioxide.

Because there are two carbon atoms in the aldehyde, there'll have to be 2 mol of carbon dioxide.

Then balance the H's by putting a 2 in front of the water molecule.

Now balance the O's - you have 2 in the "H"_2"O" molecule and 4 in the "CO"_2, a total of 6, and one in "CH"_3"CHO" on the other side - so you need 5 more on the LHS. :. multiply the "O"_2 by 5/2

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