chemistry

Xenon trioxide

Xenon trioxide 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 Xenon trioxide rather than just read about it. In short: Xenon trioxide is an unstable compound of xenon in its +6 oxidation state. It is a very powerful oxidizing agent, and liberates oxygen from water slowly, accelerated by exposure to sunlight.

Key takeaways

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

Reference excerpt

Xenon trioxide is an unstable compound of xenon in its +6 oxidation state. It is a very powerful oxidizing agent, and liberates oxygen from water slowly, accelerated by exposure to sunlight. It is dangerously explosive upon contact with organic materials. When it detonates, it releases xenon and oxygen gas.

Chemistry Synthesis of xenon trioxide is by aqueous hydrolysis of XeF6:

XeF6 + 3 H2O → XeO3 + 6 HF The resulting xenon trioxide crystals are a strong oxidising agent and can oxidise most substances that are at all oxidisable. However, it is slow-acting and this reduces its usefulness. Above 25 °C, xenon trioxide is very prone to violent explosion:

2 XeO3 → 2 Xe + 3 O2 (ΔHf = −403 kJ/mol) When it dissolves in water, an acidic solution of xenic acid is formed:

XeO3(aq) + H2O → H2XeO4 ⇌ H+ + HXeO−4 This solution is stable at room temperature and lacks the explosive properties of xenon trioxide. It oxidises carboxylic acids quantitatively to carbon dioxide and water. Alternatively, 15-crown-5 coordinates to xenon trioxide to give a complex stable at room-temperature against mechanical shock. Alternatively, it dissolves in alkaline solutions to form xenates. The HXeO−4 anion is the predominant species in xenate solutions. These are not stable and begin to disproportionate into perxenates (+8 oxidation state) and xenon and oxygen gas. Solid perxenates containing XeO4−6 have been isolated by reacting XeO3 with an aqueous solution of hydroxides. Xenon trioxide reacts with inorganic fluorides such as KF, RbF, or CsF to form stable solids of the form MXeO3F.

Physical properties Hydrolysis of xenon hexafluoride or xenon tetrafluoride yields a solution from which colorless XeO3 crystals can be obtained by evaporation. The crystals are stable for days in dry air, but readily absorb water from humid air to form a concentrated solution. The crystal structure is orthorhombic with a = 6.163 Å, b = 8.115 Å, c = 5.234 Å, and 4 molecules per unit cell. The density is 4.55 g/cm3.

Safety XeO3 should be handled with great caution. Samples have detonated when undisturbed at room temperature. Dry crystals react explosively with cellulose.

References

External links Webelements periodic table: page on Xenon(VI) oxide

Illustrations

Worked examples

Example 1 — a first encounter with Xenon trioxide

Start with the simplest possible case. Write down what Xenon trioxide 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 Xenon trioxide 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 Xenon trioxide 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 Xenon trioxide

In research: Xenon trioxide 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 Xenon trioxide 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: Xenon trioxide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Inorganic compounds, Oxides, Xenon(VI) compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Xenon trioxide 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 Xenon trioxide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Xenon trioxide 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 Xenon trioxide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Xenon trioxide in simple terms?

Xenon trioxide is an unstable compound of xenon in its +6 oxidation state. It is a very powerful oxidizing agent, and liberates oxygen from water slowly, accelerated by exposure to sunlight.

Why does Xenon trioxide 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 Xenon trioxide?

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 Xenon trioxide.