Ответ:
1) Mr(SiO₂) = 28 + 16*2 = 60
w(O) = Ar*n/Mr = 16*2/60 = 0,53
2) Mr(CaCO₃) = 40 + 12+ 16*3 = 100
w(O) = Ar*n/Mr = 16*4/100 = 0,64
3) Mr(CaO) = 40+16= 56
w(O) = Ar*n/Mr = 16*1/56 = 0,286
4) Mr(Fe₃O₄) = 56*3 + 16*4 = 232
w(O) = Ar*n/Mr = 16*4/232 = 0,276
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Ответ:
1) Mr(SiO₂) = 28 + 16*2 = 60
w(O) = Ar*n/Mr = 16*2/60 = 0,53
2) Mr(CaCO₃) = 40 + 12+ 16*3 = 100
w(O) = Ar*n/Mr = 16*4/100 = 0,64
3) Mr(CaO) = 40+16= 56
w(O) = Ar*n/Mr = 16*1/56 = 0,286
4) Mr(Fe₃O₄) = 56*3 + 16*4 = 232
w(O) = Ar*n/Mr = 16*4/232 = 0,276