Given that the nucleus of 18 8O 818O is formed by 8 protons and 10 neutrons, is the mass of a neutral atom of 18 8O 818O equal to the sum of the masses of 8 atoms of 11H11H and 10 neutrons? Recall that the mass of a proton is mp=1.007276ump=1.007276u and the mass of a neutron is mn=1.008665umn=1.008665u. The mass of a neutral atom of 11H11H is mH=1.007825umH=1.007825u. View Available Hint(s)

7is b8 is d9 is c10 is a11 is d

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.