Help me….unsur penyusun senyawa berikut beserta jumlahnya :

Mg(NO3)2 = 2 Unsur Magnesium , 2 unsur Nitrogen, 6 unsur Oksigen
Fe ( PO4) = 1 unsur Fe( Besi) , 1 unsur P , 4 unsur Oksigen
Na2S = 2 Unsur Natrium, 1 Unsur S
Ca3N2 = 3 unsur Kalsium, 2 unsur Nitrogen
FeCl3 = 1 Unsur Fe ( Besi ) 3 Unsur Cl ( Klorin) 
NO2 = 1 Unsur Nitrogen, 2 unsur Oksigen
CCl4 = 1 unsur C , 4 unsur Cl 
HNO3 = 1 unsur Hidrogen, 1 unsur Nitrogen, 3 unsur Oksigen
CaCO3 = 1 Unsur Kalsium, 1 Unsur C, 3 Unsur Oksigen 

huwah, capek nulis, Semoga membantu :3