Помогите масовая часта Na2O W

Question

Помогите масовая часта Na2O
W

Answer 1

Mr (Na2O) = 23 * 2 + 16 = 62

W (Na) = 46 / 62 = 0.7419 = 74.19%

W (O) = 16 / 62 = 0.2581 = 25.81%