1molecule=6.022 �10^23

Calculating Moles of Oxygen in a Sample of Vitamin C

To determine the number of moles of oxygen present in a sample of vitamin C, we need to use Avogadro's number and the molar mass of oxygen.

Avogadro's Number:
Avogadro's number is a fundamental constant in chemistry that relates the number of particles (atoms, molecules, ions) to the amount of substance. The value of Avogadro's number is approximately 6.022 × 10^23 mol^-1.

Molar Mass of Oxygen:
The molar mass of oxygen (O) is 16.00 g/mol.

Step 1: Calculate the Number of Oxygen Atoms:
The given sample of vitamin C contains 2.58 × 10^24 oxygen atoms.

Step 2: Convert the Number of Oxygen Atoms to Moles:
To convert the number of oxygen atoms to moles, we divide the given number of atoms by Avogadro's number.

Number of moles = Number of atoms / Avogadro's number

Number of moles = 2.58 × 10^24 atoms / (6.022 × 10^23 mol^-1)

Number of moles ≈ 4.28

Therefore, there are approximately 4.28 moles of oxygen atoms present in the sample of vitamin C.

Step 3: Calculate the Moles of Oxygen:
As vitamin C contains one oxygen atom per molecule, the number of moles of oxygen in the sample is the same as the number of moles of oxygen atoms.

Hence, there are approximately 4.28 moles of oxygen present in the sample of vitamin C.

Summary:
In summary, to calculate the number of moles of oxygen in a sample of vitamin C:

1. Determine the number of oxygen atoms in the sample.
2. Convert the number of oxygen atoms to moles by dividing by Avogadro's number.
3. The resulting value represents the number of moles of oxygen in the sample.

By following these steps, we found that there are approximately 4.28 moles of oxygen present in the given sample of vitamin C.