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  • 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 mol_{–1} and 32 g mol^{–1} respectively.

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 mol–1 and 32 g mol–1 respectively.

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Answer:

Molar mass of HgS =200.6+32=232.6gmol^{-1}
Mass of Hg in 232.6g of HgS =200.6g
Mass of Hg in 225g of HgS =\frac{200.6}{232.6}\times225
                                            =194.04g

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