Sodium chloride is produced from its elementsthrough a synthesis reaction. What mass of each
reactant would be required to produce 25.0 mol
of sodium chloride?

Answer:

                     Mass of Sodium  =  574.75 g

                     Mass of Chlorine  =  886.25 g

Explanation:

                   The  balance chemical equation for the synthesis of NaCl is,

                                        2 Na + Cl₂ → 2 NaCl

Step 1: Find out moles of each reactant required,

According to balance chemical equation,

                 2 moles of NaCl is produced by  =  2 moles of Na

So,

         25 moles of NaCl will be produced by  =  X moles of Na

Solving for X,

                     X  =  25 mol × 2 mol /  2 mol

                     X  =  25 moles of Na

Similarly for Cl₂,

According to balance chemical equation,

                 2 moles of NaCl is produced by  =  1 mole of Cl₂

So,

         25 moles of NaCl will be produced by  =  X moles of Cl₂

Solving for X,

                     X  =  25 mol × 1 mol /  2 mol

                     X  =  12.5 moles of Cl₂

Step 2:Convert each moles to mass as;

Mass  =  Moles × Atomic Mass

For Na,

Mass  =  25 mol × 22.99 g/mol

Mass  =  574.75 g

For Cl₂,

Mass  =  12.5 mol × 70.90 g/mol

Mass  =  886.25 g

Mass of Sodium =  574.75 g and Mass of Chlorine =  886.25 g

The  balanced chemical equation for the synthesis of NaCl:

The number of moles can be calculated by dividing given mass over molar mass.

2 Na + Cl₂ → 2 NaCl

Calculation for moles:

2 moles of NaCl is produced by  =  2 moles of Na

So,

25 moles of NaCl will be produced by  =  x moles of Na

Solving for x,

x  =  25 mol × 2 mol /  2 mol

x =  25 moles of Na

Similarly for Cl₂,

2 moles of NaCl is produced by  =  1 mole of Cl₂

So,

25 moles of NaCl will be produced by  =  x moles of Cl₂

Solving for x,

x  =  25 mol × 1 mol /  2 mol

x =  12.5 moles of Cl₂

Conversion of moles from mass:

Mass  =  Moles × Atomic Mass

For Na,

Mass  =  25 mol × 22.99 g/mol

Mass  =  574.75 g

For Cl₂,

Mass  =  12.5 mol × 70.90 g/mol

Mass  =  886.25 g

Find more information about Molar mass here:

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