n(cu)=N(cu)/Na=1,2*10^23/6,02*10^23=0,2 моль
m(cu)=n(cu)*M(cu)=0,2*63,5=12,7 г
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n(cu)=N(cu)/Na=1,2*10^23/6,02*10^23=0,2 моль
m(cu)=n(cu)*M(cu)=0,2*63,5=12,7 г