Answered: Calculate the number of oxygen atoms in…

Calculate the number of oxygen atoms in a 140.0 g sample of dinitrogen tetroxide (N,0). Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits. x10

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter2: Atoms And Molecules

Section: Chapter Questions

Problem 2.3E

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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

Interconverting number of atoms and mass of compound
Calculate the number of oxygen atoms in a 140.0 g sample of dinitrogen tetroxide (N,0,).
Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
x10
Explanation
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Expert Solution

Step 1

First calculate the number of moles of N₂O₄, then from the formula as we see 1mol N₂O₄ = 4 mol oxygen atoms

Calculate for the moles in 140g and then multiply wit Avogadro's number to get the answer as shown in the picture below

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