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 formula of A is:
(Given: atomic mass of Cr = 52 amu and

Question

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 formula of A is:
(Given: atomic mass of Cr = 52 amu and Cl = 35 amu)

Canvas Classes · Accepted Answer

Strategy:
 Use the percentage of mass lost to concentrated  as the weight of the water of crystallization (water outside the sphere).

Step 1: Calculate total molecular weight
Formula comprises: 1 Cr, 3 Cl, 12 H, 6 O.
.

Step 2: Calculate moles of water lost
Conc.  explicitly dehydrates water of crystallization.
Mass lost =  of 265 g.
Mass = .
Number of moles of water =  moles.

Step 3: Deduce structure
Since 2 moles of water are outside the coordination sphere as waters of crystallization, the

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