Uchta kulonometrdan elektr toki o‘tkazildi. Elektroliz jarayonida misli kulonometr katodining massasi 0,32 g ga, ikkinchi kulonometrning katodi 0,56 g ga, uchunchisiniki 1,08 g ga ortdi. Ikkinchi va uchinchi kulonometrlar qaysi metaldan yasalgan?

n(ē) = m·z/M; Cu: 0,32·2/64=0,01 mol ē. Uchinchi: M/z = 1,08/0,01 = 108 ⇒ Ag (z=1). Ikkinchi: M/z = 0,56/0,01 = 56 ⇒ Cd (M=112, z=2).

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