A salesperson comes to the door selling a service designed to check “chimney rot”. He explains that if the CO2 content of the gases leaving the chimney rises above 15%, it is dangerous to your health, is against the city code, and causes your chimney to rot. On checking the flue gas from the furnace, he finds it is 30% CO2. Suppose that you are burning natural gas which is about 100% CH4 and that the air supply is adjusted to provide 130% excess air. Do you need his service?

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Asked Feb 17, 2019
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A salesperson comes to the door selling a service designed to check “chimney rot”. He explains that if the CO2 content of the gases leaving the chimney rises above 15%, it is dangerous to your health, is against the city code, and causes your chimney to rot. On checking the flue gas from the furnace, he finds it is 30% CO2. Suppose that you are burning natural gas which is about 100% CH4 and that the air supply is adjusted to provide 130% excess air. Do you need his service?

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Step 1

The reaction of methane with air is written as:

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Step 2

Let the basis of the reaction be 100 mol CH4. From the stoichiometry of the reaction, 100 mol CH4 reacts with 200 mol O2 to form 100 mol CO2 and 200 mol H2O.

 

It is given that 130% excess air is fed, thus moles of O2 fed and unreacted O2 will be:

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Step 3

Since, air is fed to burn methane, N2 remains unreacted....

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