A 3.00-liter -flask initially contains 3.00mol of gas a and 1.50 mol of gas b. The concentration of gas c is 0.106mol/L determine the equilibrium concentration of gas b.

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. 

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))

Nonmetal are moldable and easily shaped

The answer is c - the principal of original lateral continuity.