Ответ:
а) M(CO₂) = 12 + 16*2 = 44, w(C) = (12/44) * 100% ≈ 27.27%
б) M(CO) = 12 + 16 = 28, w(C) = (12/28) * 100% ≈ 42.86%
в) M(SiO₂) = 28 + 16*2 = 60, w(Si) = (28/60) * 100% ≈ 46.67%
г) M(Fe₃O₄) = 56*3 + 16*4 = 232, w(Fe) = (168/232) * 100% ≈ 72.41%
б) M(CO) = 12 + 16 = 28, w(C) = (12/28) * 100% ≈ 42.86%
в) M(SiO₂) = 28 + 16*2 = 60, w(Si) = (28/60) * 100% ≈ 46.67%
г) M(Fe₃O₄) = 56*3 + 16*4 = 232, w(Fe) = (168/232) * 100% ≈ 72.41%
