What is the percentage of mercury (by mass) in the 4.75g sample of dimethylmercury?

To calculate the percentage of Mercury by mass in a 4.75 g sample of dimethylmercury (C₂H₆Hg), first determine the molar mass of dimethylmercury. The molar mass of dimethylmercury is approximately 218.65 g/mol, with mercury (Hg) contributing about 200.59 g/mol. The percentage of mercury by mass is calculated as (200.59 g/mol / 218.65 g/mol) × 100%, which is approximately 91.7%. Thus, in a 4.75 g sample, the mass of mercury is about 4.36 g, resulting in a mercury percentage of around 91.7%.