40.2 grams of Hydrogen Chloride (HCl) is decomposed. 12 grams of Chlorine (Cl) is formed. How many grams of Water (H2O) was formed?

3.05 g

Explanation:

The reaction that takes place is:

As the decomposition not necessarily was complete we'll work with the given mass of product formed. We convert the 12 grams of chlorine to moles, using its molar mass:

Then we convert Cl₂ moles to H₂O moles:

Finally we convert moles to grams:

explanation:

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