Question

помогите пожалуйста ​

Answer 1

Mr(Na3AlF6) = 3Ar(Na) + Ar(Al) + 6Ar(F) = 23*3 + 27 + 19*6 = 210

W(Na) = 69/210 * 100% ≈ 33%

W(Al) = 27/210 * 100% ≈ 13%

W(F) = 114/210 * 100% ≈ 54%