giúp e với @@@@@@@@@@@@@

`a)`

Đặt `\%m_{\text{}_{29}^{65}Cu}=x\%`

`->\%m_{\text{}_{29}^{63}Cu}=(100-x)\%`

NTK trung bình copper là

`{65x+63(100-x)}/{100}=63,54`

`->x=27`

Vậy `\%m_{\text{}_{29}^{65}Cu}=27\%`

`b)`

`\%m_{\text{}_{29}^{63}Cu}=100-27=73\%`

`n_{CuS}={14,331}/{63,54+32}=0,15(mol)`

`->m_{\text{}_{29}^{63}Cu}=0,15.63.73\%=6,8985(g)`

`c)`

Trong `CuSO_4:`

`\%m_{\text{}_{29}^{65}Cu}={65.27\%}/{63,54+32+16.4}.100\%\approx 11\%`

`d)`

Trong `CuSO_3.Cu(OH)_2:`

`\%m_{\text{}_{29}^{63}Cu}={2.63.73\%}/{63,54+32+16.3+63,54+(16+1).2}.100\%\approx 38,15\%`