Ответ:
Mr(Na2SO4) = 2×Ar(Na) + Ar(S) + 4×Ar(O);
Mr(Na2SO4) = 2×23 + 32 + 4×16 = 46 + 32 + 64 = 142.
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Ответ:
Mr(Na2SO4) = 2×Ar(Na) + Ar(S) + 4×Ar(O);
Mr(Na2SO4) = 2×23 + 32 + 4×16 = 46 + 32 + 64 = 142.