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28 September, 22:11

Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles O2 to the number of moles of Fe reacted?

4Fe + 3O2 - -> 2Fe2O3

4 mol Fe

3 mol O2

2 mol Fe2O3

4 mol Fe

4 mol Fe

2 mol Fe2O3

3 mol O2

2 mol Fe2O3

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Answers (2)
  1. 28 September, 22:14
    0
    The correct answer is the first option: 4 mol Fe, 3 mol O2

    Explanation:

    Hello!

    Let's solve this!

    The reaction is:

    4Fe + 3O2 - --> 2Fe2O3

    This reads that every 4 moles of iron consumed, we need 3 moles of oxygen and when they react, we get 2 moles of Fe2O3.

    Let's analyze each of the options:

    4 mol Fe

    3 mol O2: this is correct since it tells us how much iron and how much oxygen we need.

    2 mol Fe2O3

    4 mol Fe: it is not correct because it does not tell us anything about oxygen.

    4 mol Fe

    2 mol Fe2O3: it is not correct because it does not tell us anything about oxygen.

    3 mol O2

    2 mol Fe2O3: it is not correct because, although it says of oxygen, it does not relate it to iron.

    We conclude that the correct answer is the first option: 4 mol Fe

    3 mol O2
  2. 28 September, 22:31
    0
    Option A says we have 4 moles of Fe for each 3 moles O2

    This is correct For 3 moles of O2 consumed, we need 4 moles of Fe to be reacted

    Explanation:

    Step 1: Data given

    Step 2: The balanced equation

    4Fe + 3O2 → 2Fe2O3

    Step 3: Calculate the mol ratio

    For 3 moles O2 we'll have 4 moles Fe

    Option A says we have 4 moles of Fe for each 3 moles O2

    This is correct For 3 moles of O2 consumed, we need 4 moles of Fe to be reacted

    Option b says we have 2 mole Fe2O3 for each 4 moles Fe

    This doesnt say anything about O2. So doesn't apply for this question.

    Option C says we have 4 moles of Fe for each 2 moles Fe2O3

    This is the same as option B, so doesn't apply for this question.

    Option D says for each 3 moles of O2 we have 2 Fe2O3

    This is true, but doesn't say anything about Fe so doesn't apply here.
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