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x= 45 g
M Cr(NO3)3 = 238g/mol
n=45/238=0,189 mola
Cr(NO3)3 --> Cr3+ + 3NO3-
0,189mola 0,189 3*0,189
0,189+3*0,189=0,756 mola
1 mol = 6,023*10^23 cząsteczek
0,756 = y
y=4,55*10^23 jonów ;)