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Preparation of Haloalkane from Alkene

Chlorine is p...

Question

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO₂) with aqueous hydrochloric acid according to the reaction

4HCl₍_aq₎ + MnO₂₍_s₎ → 2H₂O₍_l₎ + MnCl₂₍_aq₎ + Cl₂₍_g₎

How many grams of HCl react with 5.0 g of manganese dioxide?

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Solution

1 mol [55 + 2 × 16 = 87 g] MnO₂ reacts completely with 4 mol [4 × 36.5 = 146 g] of HCl.

5.0 g of MnO₂ will react with

of HCl

= 8.4 g of HCl

Hence, 8.4 g of HCl will react completely with 5.0 g of manganese dioxide.

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