Ответ:
дано
m(Mg) = 12 g
m(HCL) = 50 g
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m(Cu)-?
Mg+2HCL-->MgCL2+H2
M(Mg) = 24 g/mol
n(Mg) = m/M = 12 / 24 = 0.5 mol
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 50 / 36.5 = 1.34 mol
n(Mg) < n(HCL)
CuO+H2-->Cu+H2O
n(Mg) = n(Cu) = 0.5 mol
M(Cu) = 64 g/mol
m(Cu)= n*M = 0.5 * 64 = 32 g
ответ 32 г
Объяснение: