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9th Class Science Atoms and Molecules Question Bank 9th CBSE Science Atoms and Molecules

  • question_answer
      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 32 g respectively]. 

    Answer:

      Molar mass of HgS =200.6+32= 232.6 g       232.6 g HgS contains Hg = 200.6      225 e HgS will contain =194.05 g


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