Discussion
Assertion (A): Nitrogen is carried through a combustion calculation even though it does not react.
Reason (R): It absorbs heat and dilutes the flue gas, and its unchanged amount serves as a tie component.
Answer: C
Both are true and the reason gives both uses: it lowers the flame temperature substantially and it relates the air supplied to the flue gas produced without any further information. Roughly four moles accompany every mole of oxygen.
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