1. Determine the molar mass of dimethylmercury:
* Carbon (C): 12.01 g/mol * 2 = 24.02 g/mol
* Hydrogen (H): 1.01 g/mol * 6 = 6.06 g/mol
* Mercury (Hg): 200.59 g/mol
* Total molar mass: 24.02 + 6.06 + 200.59 = 230.67 g/mol
2. Calculate the number of moles:
* Moles = mass / molar mass
* Moles = 7.10 g / 230.67 g/mol
* Moles ≈ 0.0308 mol
3. Use Avogadro's number to find the number of molecules:
* Avogadro's number: 6.022 x 10²³ molecules/mol
* Number of molecules = moles * Avogadro's number
* Number of molecules ≈ 0.0308 mol * 6.022 x 10²³ molecules/mol
* Number of molecules ≈ 1.85 x 10²² molecules
Therefore, a 7.10 g sample of dimethylmercury contains approximately 1.85 x 10²² molecules.
Important Note: Dimethylmercury is extremely toxic and should be handled with extreme caution. This calculation is for educational purposes only.
