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What mass of oxygen is required for burning 1 kg of iron?

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in Casting-Forming-Welding II by (119k points)
What mass of oxygen is required for burning 1 kg of iron?

(a) 1.12 kg

(b) 2.67 kg

(c) 2.35 kg

(d) 1.92 kg

The question was asked during an internship interview.

My enquiry is from Air Requirements and Metallurgical Control for Cupola topic in chapter Metal Furnace and Practice of Casting-Forming-Welding II

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Correct choice is (b) 2.67 kg

The best I can explain: Oxygen is the primary requirement for the process of burning to take place. For the burning of a metal such as iron, a high amount of oxygen will be needed. The mass of oxygen required for burning iron is 2.67 kg.

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