1. Two chlorides of iron were prepared: one by addition of dry chlorine gas; the other by addition of dry hydrogen chloride gas. 4.5 g of iron reacted with chlorine gas to form 13.01 g of the
chloride. 2.8 g of the iron reacted with the hydrogen chloride to give 6.35 g of the other chloride.
(i) Calculate the mass of chlorine which combined with 2.8 g of iron in each compound.
(ii) Find the ratio of the different masses of chlorine that combined with the 2.8 g of iron.
(iii) Which of the laws of chemical combination is illustrated by the data obtained from the
experiment?

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.