169.88/6.022x10^23
If the problem is 169.88 / (6.022 x 1023) then the answer is 28.21 x 10-23 = 2.821 x 10-22.
If the problem is (169.88 / 6.022) x 1023 then the answer is 28.21 x 1023 = 2.821 x 1024.