Question

Вычислите массовые доли элементов в веществе: NaOH

Answer 1

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

ω (Na) = N (Na) * Ar (Na) * 100% / Mr (NaOH) = 23 * 1 * 100% / 40 = 57,5%;

ω (O) = N (O) * Ar (Na) * 100% / Mr (NaOH) = 16 * 1 * 100% / 40 = 40%;

ω (H) = 100% - ω (Na) - ω (O) = 100% - 57,5% - 40% = 2,5%.