chemistry

Molybdenum(III) iodide

Molybdenum(III) iodide is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Molybdenum(III) iodide rather than just read about it. In short: Molybdenum(III) iodide is the inorganic compound with the formula MoI3. Preparation Molybdenum(III) iodide is created by the reaction of molybdenum hexacarbonyl with iodine gas at 105 °C (221 °F). 2 Mo(CO)6 + 3 I2 → 2 MoI3 + 12 CO It can also be made from molybdenum(V) chloride and a solution of hydrogen iodide in carbon disulfide.

Key takeaways

Molybdenum(III) iodide belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Molybdenum(III) iodide to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Molybdenum(III) iodide from memory before moving on to harder problems.

Reference excerpt

Molybdenum(III) iodide is the inorganic compound with the formula MoI3.

Preparation Molybdenum(III) iodide is created by the reaction of molybdenum hexacarbonyl with iodine gas at 105 °C (221 °F).

2 Mo(CO)6 + 3 I2 → 2 MoI3 + 12 CO It can also be made from molybdenum(V) chloride and a solution of hydrogen iodide in carbon disulfide.

MoCl5 + 5 HI → MoI3 + 5 HCl + I2 A further method is direct reaction between molybdenum metal and excess iodine at 300 °C (572 °F).

2 Mo + 3 I2 → 2 MoI3 As molybdenum(III) iodide is the highest stable iodide of molybdenum, this is the preferred route.

Properties Molybdenum(III) iodide is a black antiferromagnetic solid that is air-stable at room temperature. In vacuum, it decomposes above 100 °C to molybdenum(II) iodide and iodine. It is insoluble in polar and non-polar solvents. Its crystal structure is isotypic with zirconium(III) iodide.

References

Momlybdenum triiodide at Web Elements

Illustrations

Worked examples

Example 1 — a first encounter with Molybdenum(III) iodide

Start with the simplest possible case. Write down what Molybdenum(III) iodide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Molybdenum(III) iodide before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Molybdenum(III) iodide ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Molybdenum(III) iodide

In research: Molybdenum(III) iodide appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Molybdenum(III) iodide in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Molybdenum(III) iodide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Iodides, Molybdenum(III) compounds, Molybdenum halides, so understanding it makes those chapters shorter.
In everyday life: Look for Molybdenum(III) iodide outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Molybdenum(III) iodide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Molybdenum(III) iodide means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Molybdenum(III) iodide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Molybdenum(III) iodide in simple terms?

Molybdenum(III) iodide is the inorganic compound with the formula MoI3. Preparation Molybdenum(III) iodide is created by the reaction of molybdenum hexacarbonyl with iodine gas at 105 °C (221 °F). 2 Mo(CO)6 + 3 I2 → 2 MoI3 + 12 CO It can also be made from molybdenum(V) chloride and a solution of hy…

Why does Molybdenum(III) iodide matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Molybdenum(III) iodide?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Molybdenum(III) iodide.