Initially a beaker contains 225.0 ml of a 0.350 m mgso4 solution. then 175.0 ml of water are added to the beaker. find the concentration of the final solution. what is the final volume?

In chemistry, particularly solutions, you must always obey the Law of Conservation of Mass. Meaning, for solutions without reactions, the moles of solute in the solution does not change after dilution. The equation would be:

M1V1 = M2V2
(0.350 M)(225mL) = M2(175 + 225 mL)
M2 = 0.197 M

The final concentration would be 0.197 M. 

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False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other