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Question

0.66g of platinichloride of a monoacid base left 0.150g of platinum on ignition. Calculate its molecular weight. (Pt=195)

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Solution

Let the base is B.
B+H2PtCl6B2H2P tCl6Pt
Base 0.66g 0.150g
(dibasic}

If W is the weight of the monoacidic base, then molecular wt of plantinchloride

=2W+2+195+6×35.5=(2W+410)g

Now (2W+410)g of compound contains 195g of Pt

So 0.66g of compound contains 1952W+410×0.66=0.150g

Mol. wt of base =w=224g

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