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Sn - cyna (119u)
Pb - ołów (207u)
119u + 207u = 326u
326u --- 119u Sn
300g --- x
-------------------------
x = 109,51g Sn
326u --- 207u Pb
300g --- x
--------------------------
x = 190,49g Pb
Zadanie 2.
200g --- 100%
x --- 1,7%
-----------------
x = 3,4g
Zadanie 3.
6,54g --- 100%
x --- 60%
------------------
x = 3,924g