Consider a process in which a carbon-based fuel is combusted in the presence of

Question

Consider a process in which a carbon-based fuel is combusted in the presence of 70% excess oxygen (assume that all of the oxygen present come from an air feel stream). Based on the information given above, which of the following statements are true? Select all that apply. Exactly 70% of the oxygen presence in the process is not consumed. 70% of the fuel in the process undergoes complete combustion. At least 41% of the oxygen present in the grocers is not consumed There is 70% more air present in the process that would be necessary for the complete combustion of all the fuel There is 70% more oxygen present in the process that would be necessary for the complete combustion of all of the fuel

Explanation / Answer

the air is feed in the reaction vessel in which certain carbon based fuel is present ...the air contains 70% oxygen hence ... option 3 can not be correct as we don't know what is the quantity of conbon fuel.

we should also rule out option 3 as the air stream is always in excess ..so in any case the oxygen will not be less for the reaction.

while considering the above statement that we just confirmed ... option 4 and 5 are asserting something which is not given ....so we can say these have to be true ..

so by elemination technique ...option 1 can be said as valid

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