Combustion

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samanthaywu
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Joined: Wed Sep 30, 2020 9:51 pm

Combustion

Postby samanthaywu » Mon Nov 23, 2020 4:59 pm

How do you know when to assume the remaining reactant is O2? O2 is usually not the limiting reactant but sometimes it's not explicitly mentioned.

Shanna Yu 1C
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Re: Combustion

Postby Shanna Yu 1C » Mon Nov 23, 2020 9:32 pm

Hi!

Someone can correct me if I'm wrong, but I believe combustion problems typically operate under the assumption that oxygen is in excess unless it's stated otherwise.

Arti_Patel_3H
Posts: 107
Joined: Wed Sep 30, 2020 9:38 pm

Re: Combustion

Postby Arti_Patel_3H » Mon Nov 23, 2020 9:44 pm

Shanna Yu 3F wrote:Hi!

Someone can correct me if I'm wrong, but I believe combustion problems typically operate under the assumption that oxygen is in excess unless it's stated otherwise.


You're correct. Usually, it is assumed there is an excess of O2 in combustion reactions.

Sonel Raj 3I
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Re: Combustion

Postby Sonel Raj 3I » Mon Nov 23, 2020 9:53 pm

If there is no amount value given for O2, like the other replies say, you usually assume O2 is in excess in a combustion reaction. From what I have seen in this class so far, they usually tell us that the experiment is performed with an "excess of oxygen," so I don't think we have to worry about it too much!

Emily_Stenzler_2H
Posts: 196
Joined: Wed Sep 30, 2020 10:02 pm

Re: Combustion

Postby Emily_Stenzler_2H » Mon Nov 23, 2020 10:58 pm

I believe this is just something we have to memorize for this class- we just need to know the typical products and reactants for a combustion reaction, and we need to know that O2 is usually in excess.

Katie Le 3K
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Re: Combustion

Postby Katie Le 3K » Tue Nov 24, 2020 1:22 am

O2 is in excess for combustion problems. i think its just something we assume unless explicitly stated otherwise

Rose_Malki_3G
Posts: 127
Joined: Wed Sep 30, 2020 10:02 pm

Re: Combustion

Postby Rose_Malki_3G » Tue Nov 24, 2020 1:38 am

In general, it is usually assumed that the O2 is in excess so it would usually not be the limiting reactant.

George Hernandez 3I
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Re: Combustion

Postby George Hernandez 3I » Tue Nov 24, 2020 11:56 pm

The problem should always tell you when an excess reactant is present in a reaction. So then you'll have to work with the limiting reactant to solve whatever it is the problem is asking. Oxygen will very typically always be in excess since it is unusual, in the real world, to run out of oxygen in an environment for a combustion reaction. However, if they give you a certain number of moles of oxygen to work with, at that point, you should use your molar ratio knowledge to figure if it's the limiting reactant in that reaction.

Edwin Liang 1I
Posts: 93
Joined: Wed Sep 30, 2020 9:34 pm

Re: Combustion

Postby Edwin Liang 1I » Wed Nov 25, 2020 10:02 pm

Hi,
In combustion reactions, the Oxygen is usually in excess unless its specific amount is given

tholz11
Posts: 70
Joined: Wed Sep 30, 2020 9:38 pm

Re: Combustion

Postby tholz11 » Sun Nov 29, 2020 5:21 pm

In combustion reactions, Oxygen is always in excess unless stated otherwise!

Astha Patel 2J
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Re: Combustion

Postby Astha Patel 2J » Sun Nov 29, 2020 5:37 pm

Oxygen gas can be assumed in excess during combustion reactions unless stated otherwise.


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