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Ch.2 - Atoms, Molecules & Ions
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook
All textbooksMcMurry 8th EditionCh.2 - Atoms, Molecules & IonsProblem 44b
Chapter 2, Problem 44b

Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (b) Ethylene glycol (automobile antifreeze)

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1
Identify the colors of the atoms in the ball-and-stick model: red for oxygen (O), gray for carbon (C), blue for nitrogen (N), and ivory for hydrogen (H).
Count the number of each type of atom in the ethylene glycol molecule based on the ball-and-stick model.
List the elements in alphabetical order: carbon (C), hydrogen (H), and oxygen (O).
Write the molecular formula by combining the element symbols with their respective counts as subscripts.
Ensure the molecular formula reflects the correct number of each type of atom present in the ethylene glycol molecule.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molecular Formula

A molecular formula represents the number and types of atoms in a molecule. It is expressed by listing the chemical symbols of the elements present, followed by subscripts indicating the number of each type of atom. For example, the molecular formula for water is H2O, indicating two hydrogen atoms and one oxygen atom.

Ball-and-Stick Model

A ball-and-stick model is a three-dimensional representation of a molecule, where balls represent atoms and sticks represent the bonds between them. This model helps visualize the spatial arrangement of atoms in a molecule, making it easier to understand molecular geometry and bonding. In the context of ethylene glycol, the model would show the arrangement of carbon, oxygen, and hydrogen atoms.
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Ethylene Glycol Structure

Ethylene glycol is a simple diol with the chemical formula C2H6O2. It consists of two carbon atoms, two hydroxyl (–OH) groups, and four hydrogen atoms. Understanding its structure is essential for deriving its molecular formula, as it highlights the connectivity and arrangement of atoms that contribute to its properties and uses, such as in antifreeze.
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Related Practice
Textbook Question

In the following drawings, red and blue spheres represent atoms of different elements. Match the molecular pictures (a)–(c) with the following descriptions: (i) a pure substance consisting of a compound (ii) a pure substance consisting of an element (iii) a mixture of element

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Textbook Question

Give molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (c) Acetic acid (vinegar)

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Textbook Question
How many elements are presently known? About how many occur naturally?
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Textbook Question

What are the molecular weights of the following pharmaceuticals? (a) C33H35FN2O5 (atorvastatin, lowers blood cholesterol)

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Textbook Question

Which represents a Ca atom with two positive electrical charges (Ca2+)? (a)

(b)

(c)


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Textbook Question

Which represents an F atom with one minus charge (F-)? (a)

(b)

(c)

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