Vivian Marlowe
Ethyl alcohol, also known as ethanol, is a widely used organic compound with the chemical formula CH3CH2OH or C2H5OH. It has a variety of applications, including as a solvent, fuel, and active ingredient in alcoholic beverages. To determine the molar mass of ethyl alcohol, you can follow a systematic process. First, refer to the periodic table to identify the valencies and atomic weights of the elements in the chemical formula. Then, use this information to calculate the molar mass. The molar mass of ethyl alcohol is always 46.07 g/mol, and by understanding its composition and molar mass, we can gain insights into its chemical behaviour and applications.
| Characteristics | Values |
|---|---|
| Chemical Formula | C2H5OH, CH3CH2OH, C2H6O |
| Number of Atoms | 1 oxygen atom, 2 carbon atoms, 6 hydrogen atoms |
| Molar Mass | 46.07 g/mol |
| Density | 0.790 g/cm3 |
| Boiling Point | 78.37 °C |
| Melting Point | -114.3 °C |
| Solubility | Miscible with water and other organic solvents |
| Flammability | Easily flammable, no spontaneous combustion |
| Odour | Pungent |
| Taste | Sharp, intensely aromatic, slightly sweet aftertaste |
| Other Names | Absolute alcohol, methylcarbinol, grain alcohol, wine alcohol, etc. |
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What You'll Learn
Understand the chemical formula of ethyl alcohol
Ethyl alcohol, also known as ethanol, is a volatile, flammable, colourless liquid with a pungent taste. It is the active ingredient in alcoholic beverages and is the second most consumed drug globally, after caffeine.
The chemical formula for ethyl alcohol is C2H5OH, which can also be written as CH3CH2OH or C2H6O. In this formula, 'C' represents carbon, 'H' represents hydrogen, and 'O' represents oxygen. This formula indicates that each molecule of ethyl alcohol is composed of two carbon atoms, six hydrogen atoms, and one oxygen atom.
The name "ethanol" originates from the ethyl group, which was coined in 1834 and officially adopted in 1892. The "eth-" prefix and the qualifier "ethyl" in "ethyl alcohol" are derived from the name "ethyl" assigned by Justus Liebig in 1834 to the group C2H5. The word "ethyl" comes from the Ancient Greek "aithēr", meaning "upper air", and the Greek word "hylē", meaning "wood, raw material".
Ethyl alcohol is produced naturally through the fermentation process of sugars by yeasts or via petrochemical processes such as ethylene hydration. It has a wide range of applications, including its use as a solvent, fuel, antiseptic, disinfectant, and in the synthesis of other organic compounds.
To calculate the molar mass of ethyl alcohol, you can follow these steps:
- Refer to the periodic table to identify the valence and atomic weights of the elements in the chemical formula.
- Use the formula to calculate the molar mass:
Molar mass = (Atomic weight of Carbon x 2) + (Atomic weight of Hydrogen x 6) + Atomic weight of Oxygen
The molar mass of ethyl alcohol is approximately 46.07 g/mol.
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Identify the number of atoms
To identify the number of atoms in a molecule of ethyl alcohol (ethanol), you can refer to its chemical formula, which is typically written as C2H5OH. In this formula, the numbers before each element indicate how many atoms of that element are present. So, there are two carbon atoms (C), five hydrogen atoms (H), one oxygen atom (O), and one additional hydrogen atom (H). This adds up to a total of nine atoms in a molecule of ethyl alcohol.
Another way to determine the number of atoms is to consider the molecular mass of ethyl alcohol, which is 46.07 g/mol. You can use the periodic table to find the atomic masses of carbon, hydrogen, and oxygen. Carbon has an atomic mass of 12.01 g/mol, hydrogen has an atomic mass of 1.01 g/mol, and oxygen has an atomic mass of 16 g/mol. By multiplying the atomic mass of each element by the number of atoms and then adding them together, you can verify the total molecular mass:
- 2 x Carbon) + (6 x Hydrogen) + (1 x Oxygen) =
- 2 x 12.01) + (6 x 1.01) + (1 x 16) =
- 02 + 6.06 + 16 =
- 08 g/mol
This calculation aligns closely with the given molar mass of 46.07 g/mol, confirming the presence of two carbon atoms, six hydrogen atoms, and one oxygen atom in ethyl alcohol.
It's worth noting that the chemical formula for ethyl alcohol can also be written as CH3CH2OH or C2H6O, which still indicates the same number of atoms. The formula C2H5OH is simply a more condensed way of representing the molecule, following standard chemical nomenclature.
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Find the valencies of the components
To find the valencies of the components of ethyl alcohol, also known as ethanol, we must first identify the elements present in the compound. The chemical formula for ethanol is C2H5OH or CH3CH2OH, so it contains carbon, hydrogen, and oxygen atoms.
Next, we refer to the periodic table to determine the valency of each of these elements. Valency is a measure of the ability of an atom to bond with other atoms, and it is based on the number of electrons in the outermost shell of an atom, known as the valence electrons. For simple compounds, the valency is the number of bonds an atom forms with another.
Let's start with carbon. Carbon is in Group 4 (or IV) of the periodic table, so it has a valency of 4. This means that carbon can form four bonds with other atoms.
Now, let's look at hydrogen. Hydrogen is in Group 1 (or IA) of the periodic table, so it has a valency of 1. This means that hydrogen can form one bond with another atom.
Finally, let's determine the valency of oxygen. Oxygen is in Group 6 (or VIA) of the periodic table, so it has a valency of 2. This means that oxygen can form two bonds with other atoms.
In summary, the valencies of the components of ethyl alcohol (or ethanol) are as follows:
- Carbon (C): Valency of 4
- Hydrogen (H): Valency of 1
- Oxygen (O): Valency of 2
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Calculate the molar mass
To calculate the molar mass of ethyl alcohol (also known as ethanol), you can follow these steps:
First, refer to the periodic table to identify the valencies of the elements present in ethyl alcohol. The chemical formula for ethyl alcohol is C2H5OH, which means it contains carbon, hydrogen, and oxygen atoms.
Next, calculate the molar mass by summing up the atomic weights of each element in the compound, taking into account their valencies. Carbon has an atomic weight of 12 g/mol, hydrogen has an atomic weight of 1 g/mol, and oxygen has an atomic weight of 16 g/mol. Using this information, you can calculate the molar mass of ethyl alcohol:
Molar mass of C2H5OH = (2 * atomic weight of carbon) + (5 * atomic weight of hydrogen) + atomic weight of oxygen
Molar mass of C2H5OH = (2 * 12 g/mol) + (5 * 1 g/mol) + 16 g/mol
Molar mass of C2H5OH = 46 g/mol
So, the molar mass of ethyl alcohol is approximately 46 g/mol. This value is consistent with the standard molar mass of ethanol, which is widely accepted to be 46.07 g/mol.
It's important to note that molar mass is different from molecular mass or molecular weight. Molar mass is a measure of the mass of one mole of a substance, whereas molecular mass or molecular weight refers to the mass of one molecule of the substance. In the context of ethyl alcohol, the molar mass is the key concept, as it helps determine the number of moles present in a given mass or volume of the compound.
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Convert units and calculate molarity
To calculate the molarity of ethyl alcohol, also known as ethanol, when it interacts with water, you need to first determine the amount of ethyl alcohol in the solution. This is because molarity is a measure of the amount of solute in a particular solution, expressed as moles per liter.
The process of finding the molarity of ethyl alcohol involves several steps:
Step 1: Measure a specific volume of ethanol
Measure out a specific volume of ethanol, such as 10 milliliters (mL), and pour it into a container like a beaker or a glass. This measured volume will be used to calculate the grams of ethanol in the solution.
Step 2: Calculate the grams of ethanol
Since ethanol is a liquid, its volume can be converted into grams using its known density. The accepted density of ethanol is 0.790 grams per cubic centimeter (g/cm^3), or equivalently, 0.790 grams per milliliter (g/mL) since one cubic centimeter is equal to one milliliter.
So, for 10 mL of ethanol:
> 10 mL × 0.790 g/mL = 7.9 g
Step 3: Calculate the moles of ethanol
To find the number of moles of ethanol, divide the grams of ethanol by its molar mass. The molar mass of ethanol is approximately 46 grams per mole (g/mol).
Using the formula:
> moles of ethanol = grams of ethanol ÷ molar mass of ethanol
So, for 7.9 grams of ethanol:
> 7.9 g ÷ 46 g/mol ≈ 0.17 mol
Step 4: Prepare the solution and convert milliliters to liters
Now, add water to the ethanol to prepare a solution with a known volume. For instance, you can mix water with the 0.17 mol of ethanol to form a 250 mL solution.
To express the volume in liters, divide the milliliters by the conversion factor for milliliters to liters. There are 1000 mL in 1 L, so:
> 250 mL ÷ 1000 mL/L = 0.25 L
Step 5: Calculate the molarity
Finally, determine the molarity by dividing the moles of ethanol by the volume of the solution in liters.
Using the formula:
> molarity = moles of ethanol ÷ volume of solution in liters
Given that we have 0.17 mol of ethanol and 0.25 L of solution:
> molarity = 0.17 mol ÷ 0.25 L = 0.68 mol/L
So, the molarity of ethyl alcohol in this solution is approximately 0.68 moles per liter, or 0.68 M.
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