For a polyurethane sample in which carbon, nitrogen, and oxygen were detected by XPS, the sensitivity factor for C was 0.25 on the spectrometer used. The sensitivity factor for N was 0.42 and that for O was 0.66 on the same spectrometer. If the peak areas were C(1s) 5 26,550, N(1s) 5 4475, and O(1s) 5 13,222, what were the atomic concentrations of the three elements

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. 

Sorry i dont understand the question can you rephase it?