(1)四
(2)H2;点燃
(2)CuCl2;HCl;①有气泡产生;②有红色物质析出
(3)Cu;Fe;Zn
(4)CuO中Cu%=×100%=80%
3.8gCuO中mCu=3.8g ×80%=3.04g
据Cu元素守恒知:3.8g“金戒指”中mCu=3.04g“金戒指”中Cu%=×100%=80%
(1)四
(2)H2;点燃
(2)CuCl2;HCl;①有气泡产生;②有红色物质析出
(3)Cu;Fe;Zn
(4)CuO中Cu%=×100%=80%
3.8gCuO中mCu=3.8g ×80%=3.04g
据Cu元素守恒知:3.8g“金戒指”中mCu=3.04g“金戒指”中Cu%=×100%=80%