You have two beakers, one filled with 100-ml of sugar (mass= 180.0 g) and the other filled with 100-ml of water (mass= 100.0 g). you pour all the sugar and all the water together in a bigger beaker and stir until the sugar is dissolved.
a. which of the following is true about the mass of the solution?
i. it's much greater than 280.0 g
ii. it's somewhat greater than 280.0 g
iii. it's exactly 280.0 g
iv. it's somewhat less than 280.0 g
v. it's much less than 280.0 g
b. which of the following is true about the volume of the solution?
i. it's much greater than 200.0 ml
ii. it's somewhat greater than 200.0 ml
iii. it's exactly 200.0 ml
iv. it's somewhat less than 200.0 ml
v. it's much less than 200.0 ml

A iii. & B v.

Explanation:

The first question is answered thanks to the Law of Conservation of Mass. Because this is simply a process of dissolution, no new substance is formed and the mass of the solution is equal to the mass of water added to the mass of sugar: 100.0 g + 180.0 g = 280.0 g

To answer the second question, you can imagine yourself doing a similar process: No matter how many spoonfuls of sugar (or salt) you add to a glass of water, the volume of the resulting solution will not significantly increase. Thus the volume of the solution will be much less than the sum of the volume of water and the volume of sugar.

because if the tool that you are using is not balanced it there would be false mass.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.