m(Na2S2O3) = 15. 8 g
n(Na) - ?
n(S) - ?
n(O) - ?
n(Na2S2O3) = 15. 8 / 158 = 0. 1 mol
n(Na) = 2n(Na) = 2* 0. 1 = 0. 2 mol ; 2n(S) = 2 * 0. 1 = 0. 2 mol; 3n(O) = 3 * 0. 1 = 0. 3 mol | Проверка: 15. 8 = 0. 2 * 23 + 0. 2 * 32 + 0. 3 * 16; 15. 8 = 15. 8 ;
Всё сошлось. : n(Na) = 0. 2 mol , n(S) = 0. 2 mol, n(O) = 0. 3 mol .