Кр по решите дано : na no3 w(na) ? w(n) ? w(o) ?

Mr (NaNO3) = Ar (Na) + Ar (N) + Ar (O) * 3 = 23 + 14 + 16 * 3 = 85

W (Na) = Ar (Na) / Mr (NaNO3) = 23 / 85 = 0.2706 = 27.06%

W (N) = Ar (N) / Mr (NaNO3) = 14 / 85 = 0.1647 = 16.47%

W (O) = (Ar (O) * 3) / Mr (NaNO3) = 48 / 85 = 0.5647 = 56.47%

ответ: W (Na) = 27.06%; W (N) = 16.47%; W (O) = 56.47%