Question

the volatility and toxicity of mercury make this a hazardous procedure, which likely shortened the life span of many alchemists. given 100 g of cinnabar, how many grams of elemental mercury can be produced from this reaction?

Answer 1

The 100 grams of cinnabar will produce 86.22 grams of mercury.

The chemical reaction producing cinnabar from Mercury is -

HgS + $O_{2}$ → Hg + $SO_{2}$

In this chemical reaction, HgS is cinnabar, $O_{2}$ is oxygen, Hg is mercury and $SO_{2}$ is sulphur dioxide.

As per the reaction, 1 mole of cinnabar produces 1 mole of mercury. So, calculating the number of moles of 100 gram of cinnabar.

Molar mass of cinnabar = 232.66 gram/mole

Number of moles of cinnabar = 100/232.66

Number of moles of cinnabar = 0.43

So, 0.43 moles of cinnabar will produce 0.43 moles of mercury. Now, finding the mass of mercury. The molar mass of mercury is 200.6 gram/mole. Mass of mercury = 200.6 × 0.43

Mass of mercury = 86.22 grams

Thus, 86.22 grams of mercury will be produced.

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