When 9.6 grams of NaBr are dissolved in enough water to create a 165-gram solution, what is the solution's concentration, expressed as a percent by mass?

4.8% NaBr
5.5% NaBr
5.8% NaBr
6.2% NaBr

165 g - 9.6 g = 155.4 g H2O = 155.4 ml

9.6 g/155.4 ml x 100 ml = 6.18%
Answer would be 6.2%

im not a nerd cause that stupid

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To find the solution's concentration, expressed as a percent by mass, you need to calculate the mass of NaBr in the solution and then divide it by the total mass of the solution.

The given mass of NaBr is 9.6 grams.

To find the total mass of the solution, you add the mass of NaBr (9.6 grams) to the mass of water. The mass of water can be calculated by subtracting the mass of NaBr from the total mass of the solution. So, the mass of water is 165 grams - 9.6 grams = 155.4 grams.

Now you can calculate the concentration of NaBr in the solution. Divide the mass of NaBr (9.6 grams) by the total mass of the solution (155.4 grams) and multiply by 100 to convert it to a percentage.

(9.6 grams / 155.4 grams) * 100 = 6.18%

Therefore, the solution's concentration, expressed as a percent by mass, is approximately 6.18% NaBr. None of the answer choices match this result exactly, but the closest option is 6.2% NaBr.