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

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Answer:

3.05 g

Explanation:

The reaction that takes place is:

  • 4HCl + O₂ → 2Cl₂ + 2H₂O

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:

  • 12 g ÷ 70.906 g/mol = 0.169 mol

Then we convert Cl₂ moles to H₂O moles:

  • 0.169 mol Cl₂ * [tex]\frac{2molH_2O}{2molCl_2}[/tex] = 0.169 mol H₂O

Finally we convert moles to grams:

  • 0.169 mol H₂O * 18 g/mol = 3.05 g

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