Calculating the Mass of a Mole of Ethanol (C2H6O)

In summary, the mass of a mole of ethanol (C2H6O) can be calculated by finding its molar mass, which is the sum of the atomic masses of each element. The molar mass of ethanol is important in converting between moles and mass, and one mole of ethanol contains 6.022 x 10^23 molecules with a total of 16 atoms. The mass of a mole of ethanol is constant at 46.07 grams and is useful in determining reactant and product amounts in chemical reactions.
  • #1
zenith8350
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Homework Statement



How would I relate the molecular mass of ethanol (46.07 g/mol) to its formula (C2H6O) and indicate how much a mole of ethanol would weigh?


Homework Equations





The Attempt at a Solution

 
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  • #2


46 g/mol is not a molecular mass, but molar mass.

Just sum atomic masses of all atoms present in the molecule.
 

1. How do you calculate the mass of a mole of ethanol?

The mass of a mole of ethanol (C2H6O) can be calculated by first finding the molar mass of ethanol, which is equal to the sum of the atomic masses of each element in the molecule. The atomic masses of carbon, hydrogen, and oxygen are 12.01 g/mol, 1.01 g/mol, and 16.00 g/mol, respectively. Therefore, the molar mass of ethanol is (2 x 12.01) + (6 x 1.01) + (1 x 16.00) = 46.07 g/mol. This means that one mole of ethanol has a mass of 46.07 grams.

2. Why is the molar mass of ethanol important in calculating the mass of a mole?

The molar mass of ethanol is important because it represents the amount of substance in one mole of ethanol. This value allows us to easily convert between the number of moles and the mass of a substance. In the case of ethanol, the molar mass of 46.07 g/mol tells us that one mole of ethanol has a mass of 46.07 grams.

3. How many atoms are in a mole of ethanol?

A mole of any substance, including ethanol, contains 6.022 x 10^23 particles, which is known as Avogadro's number. In the case of ethanol, one mole would contain 6.022 x 10^23 molecules of ethanol, each containing a total of 16 atoms (2 carbon atoms, 6 hydrogen atoms, and 8 oxygen atoms).

4. Can the mass of a mole of ethanol vary?

No, the mass of a mole of ethanol will always be constant at 46.07 grams. This is because the molar mass of a substance is based on the atomic masses of its elements, which are constant values. Therefore, the mass of a mole of ethanol will not vary.

5. How can the mass of a mole of ethanol be used in chemical reactions?

The mass of a mole of ethanol can be used in chemical reactions to determine the amount of reactants needed and the amount of products that will be produced. This is because the molar mass of a substance allows us to easily convert between the number of moles and the mass of a substance. This information is important in determining the efficiency and yield of a chemical reaction.

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