A student performs an experiment to determine the volume of hydrogen gas produced when a given mass of magnesium reacts with excess HCl (aq), as represented by the net ionic equation below. The student begins with a 0.0360 g sample of pure magnesium and a solution of 2.0 M HCl (aq). (equation: Mg(s) + 2H+ (aq) --> Mg2+ (aq) + H2 (g))

a. Calculate the number of moles of HCl (aq) needed to react completely with the sample of magnesium.

b. Calculate the number of moles of HCl (aq) needed to react completely with the sample of magnesium.

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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.