<span> <span>It means that the amount of mass will stay the same after the change occurs.</span></span>
If it has a metal and a nonmetal. Not sure if this helps, but I hope it does :)
It would be insulator because an insulator kills electricity, it can't travel through it.
The mass percent of sulfurous acid in the new solution : 38.9%
<h3>Further explanation</h3>
<em>In a container you have 800 g of a 35% by mass solution of sulfurous acid, from which 80 ml of water evaporates. What is the mass percent of sulfurous acid in the new solution? data: density of water is 1g / ml.</em>
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solution 1
composition :
![\tt 0.35\times 800~g=280~g](https://tex.z-dn.net/?f=%5Ctt%200.35%5Ctimes%20800~g%3D280~g)
![\tt 800-280=520~g](https://tex.z-dn.net/?f=%5Ctt%20800-280%3D520~g)
solution 2(new solution)
composition :
![\tt 520-(80~ml\times 1~g/ml)=440~g](https://tex.z-dn.net/?f=%5Ctt%20520-%2880~ml%5Ctimes%201~g%2Fml%29%3D440~g)
- Total mass of new solution after water evaporated
![\tt 280(acid)+440(water)=720~g](https://tex.z-dn.net/?f=%5Ctt%20280%28acid%29%2B440%28water%29%3D720~g)
- %mass of acid in a new solution
![\tt \dfrac{280}{720}\times 100\%=38.9\%](https://tex.z-dn.net/?f=%5Ctt%20%5Cdfrac%7B280%7D%7B720%7D%5Ctimes%20100%5C%25%3D38.9%5C%25)