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IR = [Pb2+] [I-]2 = x * (2x)2 = 4x3
Stad X = 3 v IR/4
X = 1,3 * 10^-3 jest to C
C= n/V => n = C * V = 1.3 * 10^-3 * 2 = 2,6 x 10^-3 mola
M = 461 g/mol
n = m/M => m= n * M = 2,6*10^-3 * 461 = 1,2 g