Ответ:
Ar(Na)= 23; Ar(Ba)=137; Ar(Li)=7; Ar(S)=32; Ar(F)=19; Ar(K)=39; Ar(Al)=27; Ar(Ar)=40.
Mr(H2O2)=1×2+16×2=34;
Mr(Na3N)=23×3+14=69+14=83;
Mr(PH3)=31+1×3=34.
Mr(CsPO4)=133+31+16×4=228;
Mr((NH4)2S)=2×14+1×4×2+32=68;
Mr(Ca(NO3)2)=40+14×2+16×3×2=164.
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Ответ:
Ar(Na)= 23; Ar(Ba)=137; Ar(Li)=7; Ar(S)=32; Ar(F)=19; Ar(K)=39; Ar(Al)=27; Ar(Ar)=40.
Mr(H2O2)=1×2+16×2=34;
Mr(Na3N)=23×3+14=69+14=83;
Mr(PH3)=31+1×3=34.
Mr(CsPO4)=133+31+16×4=228;
Mr((NH4)2S)=2×14+1×4×2+32=68;
Mr(Ca(NO3)2)=40+14×2+16×3×2=164.