Определите относительные молекулярные массы веществ: H2SiO3, NO2 ,Ba(OH)2, HCl, Cs2O, Ga(OH)3, Li2S, КHSO4, Ca3(PO4)2, MgOHBr, Cl2O7.
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Mr(H2SiO3)=Ar(H)×2+Ar(Si)+Ar(O)×3=1×2+28+16×3=2+28+48+48=78
Mr(NO2)=Ar(N)+Ar(O)×2=14+16×2=14+32=46
Mr(Ba(OH)2)=Ar(H)×2+Ar(Ba)+Ar(O)×2=2+137+16×2=2+137+32=171
Mr(HCl)=Ar(H)+Ar(Cl)=1+35,5=36,5
Mr(Li2S)=Ar(Li)×2+Ar(S)=7×2+32=17+32=46
Mr(KHSO4)=Ar(K)+Ar(H)+Ar(S)+Ar(O)×4=39+1+32+16×4=41+32+64=137
Mr(Ca3(PO4)2)=Ar(Ca)×3+Ar(Ca)×2+Ar(P)+Ar(O)×4+Ar(O)×2=40×3+31×2+16×4×2=310
Mr(OHBr)=Ar(Mg)+Ar(O)+Ar(H)+Ar(Br)=24+1_+1+80=121
Cl2O7=Ar(Cl)×2+Ar(O)×7=35,5+16×7=71+112=187