Which one of the following is not true concerning 2.00 L of 0.100 M solution of Ca3(PO4)2? Which one of the following is not true concerning 2.00 L of 0.100 M solution of Ca3(PO4)2? This solution contains 0.200 mol of Ca3(PO4)2. This solution contains 0.600 mol of Ca2+. 1.00 L of this solution is required to furnish 0.300 mol of Ca2+ ions. This solution contains 0.800 mol of oxygen atoms. There are 6.02 × 1022 phosphorus atoms in 500.0 mL of this solution.

Idk the answer sorry

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. 

Density and pressure