Hi guys, some help with this question would be greatly appreciated. I think I've over-thought it and I cannot seem to rework my brain to think logically about it, if that makes sense. (Step 1) Carbon is burned in a limited supply of oxygen to form carbon monoxide.
(Step 2) The carbon monoxide formed in Step 1 is used to reduce iron(III) oxide to metallic iron and carbon dioxide.

Calculate the mass (in kg) of O2 needed to produce 100 kg of Fe.

Appreciate your help!

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

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explanation:

because it is