Problem: An ionic compound forms when calcium (Z = 20) reacts with iodine (Z = 53). If a sample of the compound contains 7.4×1021 calcium ions, how many iodide ions does it contain?

FREE Expert Solution

For this problem, we’re being asked to determine the number of iodide ions found in a sample of the compound that contains 7.4×1021 calcium ions

Balanced reaction: 

Ca2+ +2 I- → CaI2


The flow for this problem will be like this:

ions of Ca  (Avogadro’s number) → mol Ca (mole-to-mole comparison)  mol I (Avogadro’s number) ions of I


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Problem Details

An ionic compound forms when calcium (Z = 20) reacts with iodine (Z = 53). If a sample of the compound contains 7.4×1021 calcium ions, how many iodide ions does it contain?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Stoichiometry concept. You can view video lessons to learn Stoichiometry. Or if you need more Stoichiometry practice, you can also practice Stoichiometry practice problems.

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Based on our data, we think this problem is relevant for Professor Briggs' class at ASU.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.