\(a,CTTQ:Mg_x^{II}\left(OH\right)_y^I\\ \Rightarrow x\cdot II=y\cdot I\Rightarrow\dfrac{x}{y}=\dfrac{1}{2}\Rightarrow x=1;y=2\\ \Rightarrow Mg\left(OH\right)_2\\ b,CTTQ:Al_x^{III}\left(SO_4\right)_y^{II}\\ \Rightarrow x\cdot III=y\cdot II\Rightarrow\dfrac{x}{y}=\dfrac{2}{3}\Rightarrow x=2;y=3\\ \Rightarrow Al_2\left(SO_4\right)_3\\ c,CTTQ:Fe_x^{III}O_y^{II}\\ \Rightarrow x\cdot III=y\cdot II\Rightarrow\dfrac{x}{y}=\dfrac{2}{3}\Rightarrow x=2;y=3\\ \Rightarrow Fe_2O_3\\ d,CTTQ:Cu_x^{II}\left(CO_3\right)_y^{II}\\ \Rightarrow x\cdot II=y\cdot II\Rightarrow\dfrac{x}{y}=1\Rightarrow x=1;y=1\\ \Rightarrow CuCO_3\)
\(e,CTTQ:Na_x^I\left(PO_4\right)_y^{III}\\ \Rightarrow x\cdot I=y\cdot III\Rightarrow\dfrac{x}{y}=3\Rightarrow x=3;y=1\\ \Rightarrow Na_3PO_4\\ f,CTTQ:Ca_x^{II}\left(NO_3\right)_y^I\\ \Rightarrow x\cdot II=y\cdot I\Rightarrow\dfrac{x}{y}=\dfrac{1}{2}\Rightarrow x=1;y=2\\ \Rightarrow Ca\left(NO_3\right)_2\)
\(a,PTK_{Mg\left(OH\right)_2}=24+17\cdot2=61\left(đvC\right)\\ b,PTK_{Al_2\left(SO_4\right)_3}=27\cdot2+\left(32+16\cdot4\right)\cdot3=342\left(đvC\right)\\ c,PTK_{Fe_2O_3}=56\cdot2+16\cdot3=160\left(đvC\right)\\ d,PTK_{CuCO_3}=64+12+16\cdot3=124\left(đvC\right)\\ e,PTK_{Na_3PO_4}=23\cdot3+31+16\cdot4=164\left(đvC\right)\\ f,PTK_{Ca\left(NO_3\right)_2}=40+\left(14+16\cdot3\right)\cdot2=164\left(đvC\right)\)
CTHH : MgOH CTHH:CuCO3
CTHH: Al2(SO4)3 CTHH:Na2PO4
CTHH:Fe2O3 CTHH: CaNO3