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Find the Molar Mass of C2H8 Step-by-Step
There are 4 easy steps to find the molar mass of C2H8 based on its chemical formula.
1. Count The Number of Each Atom
The first step to finding the molar mass is to count the number of each atom present in a single molecule using the chemical formula, C2H8:
| Element | Number of Atoms |
|---|
| C (Carbon) | 2 |
| H (Hydrogen) | 8 |
2. Find Atomic Mass of Each Element
Next, using the periodic table, find the atomic mass in g/mol of each element (the molar mass of an element is equal to its atomic mass):
| Molar Mass (g/mol) |
|---|
| C (Carbon) | 12.0107 |
| H (Hydrogen) | 1.00794 |
3. Compute Mass of Each Element
Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in C2H8:
| Molar Mass (g/mol) |
|---|
| C (Carbon) | 2 × 12.0107 = 24.0214 |
| H (Hydrogen) | 8 × 1.00794 = 8.06352 |
4. Sum Each Element's Mass
Finally, add together the total mass of each element to get the molar mass of C2H8: 24.0214 g/mol + 8.06352 g/mol = 32.08492 g/mol
5. Find Mole Fraction
To find the mole fraction and percentage of each element in C2H8, divide each total from step 3 by the total molar mass found in step 4:
| Mole Fraction | Percent |
|---|
| C (Carbon) | 24.0214 ÷ 32.08492 = 0.748682 | × 100 = 74.8682% |
| H (Hydrogen) | 8.06352 ÷ 32.08492 = 0.251318 | × 100 = 25.1318% |
Molecular Weight of C2H8
32.0849 g/mol
The molar mass and molecular weight of C2H8 is 32.085. Edit Elemental Percent Composition
Convert C2H8 From Moles to Grams
Moles mol Convert to Grams and Molecules
Convert C2H8 From Grams to Moles and Molecules
Weight g Convert to Moles
Composition of C2H8
| Element | Symbol | Atomic Mass | # of Atoms | Mass Percent |
| Carbon | C | 24.0214 g/mol | 2 | 74.8682% |
| Hydrogen | H | 8.0635 g/mol | 8 | 25.1318% |
C2H8 Element Mass PercentCarbon24.0214gCarbon24.0214gHydrogen8.0635gHydrogen8.0635g C2H8 # of AtomsHydrogen8Hydrogen8Carbon2Carbon2 🛠️ Calculate Molar Mass
Instructions
This program determines the molecular mass of a substance. Enter the molecular formula of the substance. It will calculate the total mass along with the elemental composition and mass of each element in the compound.
- Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
- You can use parenthesis () or brackets [].
Finding Molar Mass
Read our article on how to calculate molar mass.
This molar mass calculator will find the molar mass of a compound and show a step-by-step solution including all calculations to get the answer. You can also ask for help in our chat or forums.
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