What is the molarity of a potassium iodide solution prepared from 0.400 mol of ki in 125 ml of solution?

Answer is: molarity of a potassium iodide solution is 3.2 M.

n(KI) =0.400 mol; amount of substance for potassium iodide.
V(solution) = 125 mL ÷ 1000 mL/L.
V(solution) = 0.125 L; volume of solution.
c(KI) = n(KI) ÷ V(solution).
c(KI) = 0.4 mol ÷ 0.125 L.
c(KI) = 3.2 mol/L; concentration of potassium iodide solution.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.