How many moles of Cl2 are needed in order to produce 100.0 grams of FeCl3 given the following equation: 2 Fe + 3 Cl2 → 2 FeCl3
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0.92moles

Explanation:

Given reaction:

              2Fe + 3Cl₂ →  2FeCl₃

Mass of FeCl₃  = 100g

Unknown:

Number of moles of Cl₂  needed = ?

Solution:

To solve this problem, we work from the known specie to the unknown.

From the mass of the FeCl₃ given, we can solve for the number of moles of the unknown.

  Number of moles  =  

  Molar mass of  FeCl₃ = 56 + 3(35.5) = 162.5g/mol

   Number of moles  =  = 0.62mole

From the reaction expression;

           2 mole of FeCl₃ is produced from 3 moles of  Cl₂  

           0.62 mole of FeCl₃ will be produced from   = 0.92mole

The number of moles of Cl₂  = 0.92moles

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explanation:

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increased stability in the completion of fluorine's outer shell.