Вычислите массовые доли элементов в процентах по формулам 1) caso3 2) CuO 3) h2so4

1)

Mr (CaSO3) = Mr = Ar (Ca) + Ar (S) + 3Ar (O) = 40 + 32 + 3 * 16 = 120

w (Ca) = Ar (Ca) / Mr = 40 / 120 = 0.33 = 33%

w (S) = Ar (S) / Mr = 32 / 120 = 0.27 = 27%

w (O) = 3Ar (O) / Mr = 48 / 120 = 0.4 = 40%

2)

Mr (CuO) = Mr = Ar (Cu) + Ar (O) = 64 + 16 = 80

w (Cu) = Ar (Cu) / Mr = 64 / 80 = 0.8 = 80%

w (O) = Ar (O) / Mr = 16 / 80 = 0.2 = 20%

3)

Mr (H2SO4) = Mr = 2Ar (H) + Ar (S) + 4Ar (O) = 2 * 1 + 32 + 4 * 16 = 98

w (H) = 2Ar (H) / Mr = 2 / 98 = 0.02 = 2%

w (S) = Ar (S) / Mr = 32 / 98 = 0.33 = 33%

w (O) = 4Ar (O) / Mr = 64 / 98 = 0.65 = 65%