Question

Помогите с химией 8 класс срочно.100балов

Answer 1

Na2SO4

1) Ar (Na) = 63

2) Ar (O) = 16

3) Ar (S) = 32

4) Mr (Na2SO4) = n * Ar (Na) + n * Ar (S) + n * Ar (O)

5) Mr (Na2SO4) = 2 * 63 + 32 + 4 * 16

6) Mr (Na2SO4) = 126 + 32 + 64 = 222

7) W (O) = nAr (O) / Mr

8) W (O) = 4 * 16 / 222 * 100%

9) W (O) = 28,83%