- Convert the mass to moles using its molar mass.
- Multiply the number of moles by Avogadro's number (6.022 x 10^23) to get the number of molecules.
The molar mass of dimethylmercury is approximately 238.69 g/mol. So, the number of moles in 4.75 g of dimethylmercury is:
Moles = Mass / Molar Mass
Moles = 4.75 g / 238.69 g/mol
Moles ≈ 0.0199 mol
Now, multiply the number of moles by Avogadro's number to find the number of molecules:
Number of Molecules = Moles × Avogadro's Number
Number of Molecules ≈ 0.0199 mol × 6.022 × 10^23 molecules/mol
Number of Molecules ≈ 1.19 × 10^23 molecules
Therefore, there are approximately 1.19 x 10^23 molecules in a 4.75-g sample of dimethylmercury.
