Question 28
Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass Hg and S are 200.6gmol−1 and 32gmol−1 respectively.
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Solution
Given,
Molar mass of Hg = 200.6gmol−1
Molar mass of S = 32gmol−1
Molar mass of HgS=200.6+32=232.6gmol−1
Mass of Hg in 232.6 g HgS=200.6g
Therefore, Mass of Hg in 225gofHgS=200.6232.6×225=194.045g