a)
1 mol-atom Pb = 207 g
207g Pb .................. 6,022x10la23 atomi Pb
m g .......................... 6,022x10la22 atomi Pb
= 20,7 g Pb
b)
nr. moli = masa/m.atomica
=> m = 1,5x84 = 126 g
c)
1 mol-atom C = 12 g
12g C .................. 6,022x10la23 atomi C
160g ......................n atomi C
= 8,03x10la23 atomi C
d)
Cu are A = 64 iar Fe are A = 56
=> din nr. moli
m.Cu = 2,5x64 = 160 g
m.Fe = 1,5x56 = 84 g
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total amestec = 160+84 = 244 g