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A certain brand of antacid was analyzed by a student who used 50.00 mL of 0.4897M HCl to dissolve the tablet. The HCl remaining after the reaction required 8.85 mL of
1.299M NaOH to back-titrate,
How many moles of HCI did the tablet neutralize?
Select one:
A. 0.4897 mol
B. 0.02449 mol
C. 0.01150 mol
D. 0.01299 mol
Antacids Data Submission
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Thermochemistry Lab Document 2020

The answer is a) carbon-12

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 correct answer is "atomic weight".