NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

Question : 36

Total: 36

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?

Solution:

4HCl(aq)

4‌mole‌or‌1‌46‌g

MnO2(s)

1‌mole‌or‌8‌7‌g

→ 2H2O(l)+MnCl2(aq)+Cl2(g)
87 g of MnO2 reacts with HCl = 146 g
5 g of MnO2 reacts with HCl =

146×5

= 9.39 ≈ 8.40 g

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