A student has a sample of the mixed salt PbCO3 . X Pb(OH)2. In a mixed salt two compounds are mixed together in one crystal. X represents the mole ratio between the two compounds, and is usually a small whole number. The student heats the sample with sulfuric acid which causes the salt to react completely, producing PbSO4(s), CO2(g) and H2O as the products. If 2.280 g of PbSO4 and 0.1104 g of CO2 are produced in the reaction, what is the value of X for this particular mixed salt?

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. 

Change in speed or direction : )