Рассчитайте массовую долю химических элементов в соединениях NaOH, H3PO4, CaCO3

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6 января, 00:43

Рассчитайте массовую долю химических элементов в соединениях NaOH, H3PO4, CaCO3

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Ундина · Answer 1

Mr (NaOH) = Mr = Ar (Na) + Ar (O) + Ar (H) = 23 + 16 + 1 = 40

w (Na) = Ar (Na) / Mr = 23 / 40 = 0.575 = 57.5%

w (O) = Ar (O) / Mr = 16 / 40 = 0.4 = 40%

w (H) = Ar (H) / Mr = 1 / 40 = 0.025 = 2.5%

Mr (H3PO4) = Mr = 3Ar (H) + Ar (P) + 4Ar (O) = 3 * 1 + 31 + 4 * 16 = 98

w (H) = 3Ar (H) / Mr = 3 / 98 = 0.0306 = 3.06%

w (P) = Ar (P) / Mr = 31 / 98 = 0.3163 = 31.63%

w (O) = 4Ar (O) / Mr = 64 / 98 = 0.6531 = 65.31%

Mr (CaCO3) = Mr = Ar (Ca) + Ar (C) + 3Ar (O) = 40 + 12 + 3 * 16 = 100

w (Ca) = Ar (Ca) / Mr = 40 / 100 = 0.4 = 40%

w (C) = Ar (C) / Mr = 12 / 100 = 0.12 = 12%

w (O) = 3Ar (O) / Mr = 48 / 100 = 0.48 = 48%