Balancing Chemical Equations

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

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Amanda 3H
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Balancing Chemical Equations

Postby Amanda 3H » Wed Oct 09, 2019 11:42 am

Hello, I am having trouble solving problem H17 of the homework.

Balance C7H16->CO2H2O.

Since there is an oxygen atom in the product and none in the reactants, is it accurate/allowed to add oxygen atoms to the reactant?

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Re: Balancing Chemical Equations

Postby asannajust_1J » Wed Oct 09, 2019 12:47 pm

In the reactants, there is an O2.

HannahBui 2K
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Re: Balancing Chemical Equations

Postby HannahBui 2K » Fri Oct 11, 2019 11:27 am

There actually is an O2 in the reactants. if you reread the question, it states that the reaction is a combustion with oxygen gas and liquid heptane!

Charisse Vu 1H
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Re: Balancing Chemical Equations

Postby Charisse Vu 1H » Fri Oct 11, 2019 12:08 pm

This reaction is a combustion reaction, so O2 would be one of the reactants. Therefore, the chemical equation would be O2 + C7H16 -> CO2 + H2O. You would first balance the carbon, so you would put 7 as the stoichiometric coefficient in front of the carbon dioxide on the products side. Then, you would balance hydrogen, so since there are 16 hydrogens on the reactants side, you would need to put an 8 in front of the H2O on the product side. Finally, you would balance oxygen. On the products side, there would be 22 oxygen. So, you would need to balance the reactants side of the equation by putting 11 in front of the O2. Your final balanced chemical equation would be 11O2 + C7H16 -> 7CO2 + 8H2O.

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Re: Balancing Chemical Equations

Postby BSolano_3A » Fri Oct 11, 2019 12:10 pm

make sure when writing down chemical formulas you don't miss any parts. Take your time with the question. The final answer should've been 11O2 + C7H16 -> 7CO2 + 8H2O.

Eunice Nguyen 4I
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Re: Balancing Chemical Equations

Postby Eunice Nguyen 4I » Fri Oct 11, 2019 12:20 pm

Be sure to pay attention to what type of reaction it is, so you don't miss anything important for the equation. You can't just add oxygen atoms to the reaction unless it's given (which it is for H17 :))

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