Wood's metal contains 50.0% bismuth, 25....

Wood's metal contains `50.0%` bismuth, `25.0%` lead, `12.5%` tin and `12.5%` cadmium by mass. What is the mole fraction of tin ?(\ (Atomic mass : `Bi=209, Pb=207, Sn=119, Cd=112)`

`0.202`

`0.158`

`0.176`

`0.221`

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