Мr(H2SO4)= 2*Ar(H)+Ar(S)+4Ar(O)=2*1а.е.м.+32а.е.м.+4*16а.е.м.=98 а.е.м.
Mr(Fe2O3)= 2*Ar(Fe)+3*Ar(O)=2*56а.е.м.+3*16а.е.м.=160 а.е.м.
Mr(Mg(OH)2)=Ar(Mg)+2*Ar(H)+2*Ar(O)=24а.е.м.+2а.е.м.+ 32а.е.м.=58 а.е.м.
Mr(Ca3(PO4)2)= 3*Ar(Ca)+2*Ar(P)+8*Ar(O)=120а.е.м.+62а.е.м.+ 128а.е.м.=310 а.е.м.
Mr(Zn(AIO2)2)= Ar(Zn)+2*Ar(Al)+4*Ar(O)=65а.е.м.+54а.е.м.+ 64а.е.м.=183 а.е.м.
Mr(Cd(N3)2)= Ar(Cd)+6Ar(N)=112а.е.м.+6*14=196 а.е.м.
Mr(C14H10)= 14*Ar(Mg)+10*Ar(H)=14*12а.е.м.+10*1а.е.м.=178 а.е.м.
Mr(KCIO3)=Ar(K)+Ar(Cl)+3*Ar(O)=39а.е.м.+35,5а.е.м.+ 3*16а.е.м.=122,5 а.е.м.
Mr(NaBr)=Ar(Na)+Ar(Br)=23а.е.м.+80 а.е.м.=103 а.е.м.
Cu ° =Cu²+ (-2 e) 1 вос-ль
N⁵+ =N⁴+ (+1e) 2 ок-ль
Cu+ 4HNO3 -> Cu(NO3)2+2H2O+2NO2
Cu⁰ = Cu²+ (-2e) 3 вос-ль
N⁵+ = N²+ (+3e) 2 ок-ль
3Cu+8HNO3 -> 3Cu(NO3)2+4H2O+2NO