Answer:
4.54 % NaOH
Explanation:
![\text{Mass percent} = \dfrac{\text{Mass of component}}{\text{Total mass}} \times 100 \, \%](https://tex.z-dn.net/?f=%5Ctext%7BMass%20percent%7D%20%3D%20%5Cdfrac%7B%5Ctext%7BMass%20of%20component%7D%7D%7B%5Ctext%7BTotal%20mass%7D%7D%20%5Ctimes%20100%20%5C%2C%20%5C%25)
Data:
Mass of NaOH = 11.6 g
Mass of water = 38.4 g
Mass of solution = 250.0 g
Calculation:
![\text{Mass \% NaOH} = \dfrac{\text{11.6 g NaOH}}{\text{250 g solution}} \times 100 \% = \textbf{4.54 \% NaOH}](https://tex.z-dn.net/?f=%5Ctext%7BMass%20%5C%25%20NaOH%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B11.6%20g%20NaOH%7D%7D%7B%5Ctext%7B250%20g%20solution%7D%7D%20%5Ctimes%20100%20%5C%25%20%3D%20%5Ctextbf%7B4.54%20%5C%25%20NaOH%7D)
Some electric appliances can be immersed in water without damage because they are well insulated. The electrical systems are well insulated and tightly sealed so that when they are immersed in water, no water can get into the electrical parts.