Mercury can be obtained by reacting mercury(ii) sulfide with calcium oxide. how many grams of calcium oxide are needed to produce 31.28 g of hg?

Explanation:

First we have to start with the reaction:

The next step is to balance the reaction, we can start with Oxygen, so:

Then we can continue with Ca:

Then we can balance S:

And finally with Hg:

With the balance reaction we know that the molar ratio between Hg nd CaO is 4:4. Therefore, the nex step is the conversion of 31.28 g Hg to moles of Hg using the atomic mass of Hg (200.59 g/mol).

The next step, using the molar ratio (4:4) and the molar mass of CaO (56.1 g/mol) we can calculate the grams of CaO that we need:

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