5. Given the Lewis electron-dot diagram:
H
H:C:H
H
Which electrons are represented by all of
the dots?
(A) the carbon valence electrons, only
(B) the hydrogen valence electrons, only
(C) the carbon and hydrogen valence
electrons
(D) all of the carbon and hydrogen
electrons

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. 

The answer to your q the total mass is 73

The answer is falsegravitational force is independent of medium and depends only on the masses of the two objects and the distance between them.