How many moles of ethyl alcohol C2H6O are in a 25.0 sample?
How do I calculate?
To calculate the number of moles in a given sample of ethyl alcohol (C2H6O), you need to divide the mass of the sample by the molar mass of C2H6O.
The molar mass of C2H6O can be calculated by adding up the atomic masses of its constituent elements:
Molar mass of C = 12.01 g/mol
Molar mass of H = 1.01 g/mol (there are 6 hydrogen atoms)
Molar mass of O = 16.00 g/mol
So, the molar mass of C2H6O is:
(2 * 12.01 g/mol) + (6 * 1.01 g/mol) + (1 * 16.00 g/mol) = 46.07 g/mol
Now that we know the molar mass is 46.07 g/mol, we can calculate the number of moles by dividing the mass of the sample by the molar mass.
If the sample has a mass of 25.0 grams, the number of moles can be calculated as:
Number of moles = Mass of sample / Molar mass
= 25.0 g / 46.07 g/mol
Calculating this gives you the number of moles of ethyl alcohol in the 25.0 gram sample.
To calculate the number of moles of ethyl alcohol (C2H6O) in a given sample, you need to use the formula:
Moles = Mass / Molar Mass
Here's how you can calculate the number of moles:
1. Determine the molar mass of ethyl alcohol (C2H6O):
- The atomic mass of carbon (C) is 12.01 g/mol.
- The atomic mass of hydrogen (H) is 1.01 g/mol.
- The atomic mass of oxygen (O) is 16.00 g/mol.
- Multiply the atomic masses by the number of atoms in the formula (subscript).
C2H6O: (2 * 12.01 g/mol) + (6 * 1.01 g/mol) + (1 * 16.00 g/mol) = 46.07 g/mol
2. Determine the mass of the sample:
- In this case, the mass of the sample is given as 25.0 g.
3. Substitute the values into the formula:
Moles = Mass / Molar Mass
Moles = 25.0 g / 46.07 g/mol
4. Calculate the answer:
Moles = 0.543 mol
Therefore, there are approximately 0.543 moles of ethyl alcohol (C2H6O) in a 25.0 g sample.