Đáp án:
`1.`
`a.`
`FeO=>A=56+16=72(dvC)`
`K_2O=>A=39.2+16=94(dvC)`
`Na_2O=>A=23.2+16=62(dvC)`
`Al_2O_3=>A=27.2+16.3=102(dvC)`
`BaO=>A=137+16=153(dvC)`
`b.`
`SO_2=>A=32+16.2=64(dvC)`
`CO_2=>A=12+16.2=44(dvC)`
`N_2O_5=>A=14.2+16.5=108(dvC)`
`P_2O_5=>A=31.2+16.5=142(dvC)`
`SO_3=>A=32+16.3=80(dvC)`
`c.`
`KCl=>A=39+35,5=74,5(dvC)`
`FeCl_2=>A=56+35,5.2=127(dvC)`
`AlCl_3=>A=27+35,5.3=133,5(dvC)`
`BaCl_2=>A=137+35,5.2=208(dvC)`
`CaCl_2=>A=40+35,5.2=111(dvC)`
