question_answer 53)

  Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are 200.6 g and 32g  respectively.

Answer:

  Given that, molar mass of Hg =200.6 g  and that of             S = 32 g  Molar mass of HgS = molar mass of the Hg + molar mass of the S Molar mass of HgS = 200.6 + 32 = 232.6 g 232.6 got HgS contains Hg= 200.6            (as molar mass of Hg= 200.6 g) 225 g of HgS will contains