Chemistry Question, Don't really know how to do it lol.

17.2 g

Explanation:

To calculate the moles :

The balanced chemical equation is:

According to stoichiometry :  

4 moles of produce =  4 moles of

Thus 0.085 moles of will require=  of

Mass of

Thus 17.2 g of will be produced form 20.0 g of HgS.

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