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Complex A has a composition of H12O6Cl3Cr. If the complex on treatment with conc. H2SO4 loses 13.5% of its original mass

 
Chemistry
Last Post by nikhil04 5 years ago
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18/09/2020 12:02 pm
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aditi07 
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Complex A has a composition of H12O6Cl3Cr. If the complex on treatment with conc. H2SO4 loses 13.5% of its original mass, the correct molecular formulas of A is:

[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]

(1) [Cr(H2O6]Cl3

(2) [Cr(H2O)4Cl2]Cl.2H2O

(3) [Cr(H2O)3Cl3].3H2O

(4) [Cr(H2O)5Cl]Cl2.H2O

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18/09/2020 12:09 pm
nikhil04 
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(2) [Cr(H2O)4Cl2]Cl.2H2O

Explanation:

Conc. H2SO4 acts as dehydrating agent.

Molar mass of given complex = 266.5 g/mol.

On treating with conc. H2SO4 the mass

lost by the complex = 13.5/100 (266.5) ≈ 36g

= 2 moles of H2O

Formula of the complex = [Cr(H2O)4Cl2]Cl.2H2O

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