\(n_{HCl}=\dfrac{7,3\%.200}{36,5}=0,4\left(mol\right)\\ a.CuO+2HCl\rightarrow CuCl_2+H_2OO\\ 0,2.........0,4........0,2.......0,2\left(mol\right)\\ b.m_{CuO}=80.0,2=16\left(g\right)\)
a. PT: CuO + 2HCl ---> CuCl2 + H2O.
b. Theo đề, ta có:
\(\dfrac{m_{HCl}}{m_{dd}}.100\%=\dfrac{m_{HCl}}{200}.100\%=7,3\%\)
=> mHCl = 14,6(g)
Ta có: nHCl = \(\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Theo PT: nCuO = \(\dfrac{1}{2}.n_{HCl}=\dfrac{1}{2}.0,4=0,2\left(mol\right)\)
=> mCuO = 0,2 . 80 = 16(g)