Ответ:
3.Mr(Fe(OH)3)= Ar(Fe) + Ar(O)*3 + Ar(H)*3= 56 + 16*3 + 1*3= 56 + 48 + 3=107
4.CaCO3
w = Ar(X) * a * 100%
Mr вещ-ва
Mr(CaCO3) = 40 + 12 + 16*3 = 100
w(Ca) = 40 * 1 * 100% = 40%
100
w(C) = 12 * 1 * 100% = 12%
w(О) = 16 * 3 * 100% = 48 %
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Ответ:
3.Mr(Fe(OH)3)= Ar(Fe) + Ar(O)*3 + Ar(H)*3= 56 + 16*3 + 1*3= 56 + 48 + 3=107
4.CaCO3
w = Ar(X) * a * 100%
Mr вещ-ва
Mr(CaCO3) = 40 + 12 + 16*3 = 100
w(Ca) = 40 * 1 * 100% = 40%
100
w(C) = 12 * 1 * 100% = 12%
100
w(О) = 16 * 3 * 100% = 48 %
100