Объяснение:
Mr(CO2) = Ar(C) + 2×Ar(O);
Mr(CO2) = 12 + 2×16 = 12 + 32 = 44.
Mr(H2S) = 2×Ar(H) + Ar(S);
Mr(H2S) = 2×1 + 32 = 2 + 32 = 34.
Mr(Cl2) = 2×Ar(Cl);
Mr(Cl2) = 2×35,5= 71 = 71
