a) CTHH chung: $Ag_xO_y$
Theo quy tắc hóa trị: $x.I=y.II$
$→\dfrac{x}{y}=\dfrac{II}{I}$
$→$ CTHH: $Ag_2O$
$→M_{Ag_2O}=2.108+16=232(đvC)$
CTHH chung: $Mg_xO_y$
Theo quy tắc hóa trị: $x.II=y.II$
$→\dfrac{x}{y}=\dfrac{II}{II}$
$→$ CTHH: $Mg_2O_2$
$→M_{Mg_2O_2}=24.2+16.2=80(đvC)$
CTHH chung: $Al_xO_y$
Theo quy tắc hóa trị: $x.III=y.II$
$→\dfrac{x}{y}=\dfrac{II}{III}$
$→$ CTHH: $Al_2O_3$
$→M_{Al_2O_3}=2.27+16.3=102(đvC)$
b) Sửa đề: Nitrat $(NO_3)$
CTHH chung: $Ag_x(NO_3)_y$
Theo quy tắc hóa trị: $x.I=y.I$
$→\dfrac{x}{y}=\dfrac{I}{I}$
$→$ CTHH: $AgNO_3$
$→M_{AgNO_3}=108+14+16.3=170(đvC)$
CTHH chung: $Mg_x(NO_3)_y$
Theo quy tắc hóa trị: $x.II=y.I$
$→\dfrac{x}{y}=\dfrac{I}{II}$
$→$ CTHH: $Mg(NO_3)_2$
$→M_{Mg(NO_3)_2}=24+(14+16.3).2=148(đvC)$
CTHH chung: $Al_x(NO_3)_y$
Theo quy tắc hóa trị: $x.III=y.I$
$→\dfrac{x}{y}=\dfrac{I}{III}$
$→$ CTHH: $Al(NO_3)_3$
$→M_{Al(NO_3)_3}=27+(14+16.3).3=213(đvC)$
