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Ajutoooor....cum se calculeaza masa moleculara relativa a urmatoarelor substante:Cr (NO3) 3; Ba (OH) 2; P2 CO3; N2S; AG NO3; MG CL2; AL2 (SO4) 3

Răspuns :

Vsidlovski
Mr (Cr(NO3))=52+14+16*3=114 Mr (Ba(OH)2)=137+16+1=154 Mr (P2CO3)=31*2+12+16*3=122 Mr (N2S)=14*2+32=60 Mr (AgNO3)=108+14+16*3=170 Mr (MgCl2)=24+35*2=94 Mr (Al2(SO4)3)=27*2+32+16*4*3=278

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