2. x
CuO+2HNO3-->Cu(NO3)2+H2O
x=2 моль
m(Ca(NO3)2)=nM=2×188=376г
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2. x
CuO+2HNO3-->Cu(NO3)2+H2O
x=2 моль
m(Ca(NO3)2)=nM=2×188=376г