A physics student stands in an 64th floor. The students weights 810 N.

Question

What is his mass and normal force?

Mass is 83?

normal force is 810?

Answer 1

Normal force is indeed 810

mass = normal force /g
= 810/9.81
= 82.57 kg
but it depends what your class uses for g. I use 9.81 but some classes even use 10m/s^2
(I guess they live on a slightly more massive planet :)