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Preparation of Na(2)SnO(2) involves the ...

Preparation of `Na_(2)SnO_(2)` involves the following set of reactions : `[Sn=119]`
`(P) Sn+2HClrarrSnCl_(2)+H_(2)`
`(Q)SnCl_(2)+2NaOHrarrSn(OH)_(2)+2NaCl`
`(R)Sn(OH)_(2)+2NaOH rarrNa_(2)SnO_(2)+2H_(2)O`
If `%` yield of reaction `(P),(Q),(R) 25 %,50 %,40 %` respectively. Calculate the mass of Sn (in kg required to produce 19.7 kg of `Na_(2)SnO_(2)`.

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