When 9.6 grams of NaBr are dissolved in enough water to create a 165 gram solution what is the concentration expressed as a perc
2 answers:
Answer:
The concentration of sodium bromide solution as a percent by mass is 5.82%.
Explanation:
Percent by Mass (w/w %) :
The percentage mass or fraction of mass of the of solute present in total mass of the solution.
Mass of solute that is sodium bromide = 9.6 g
Mass of the solution prepared = 165 g
The concentration of solution as a percent by mass:
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The masses of the components are obtained as;
- Sodium hydrogen carbonate = 3.51 g
- Sodium carbonate = 8.708 g
The term decomposition has to do with the breakdown of the given substance into its components. The components of sodium hydrogen carbonate could be identified as water vapor, carbon dioxide gas and sodium carbonate. Among these products that have been listed here, we can see that it is only the sodium carbonate that remains as a solid. The others are gases that move away from the system that is under study.
Now putting down the equation of the reaction, we have;
Now, the loss in mass must be due to the carbon dioxide and the water. Hence we obtain the loss in mass to be 10.000 g - 8.708 g = 1.292 g
Mass of sodium hydrogen carbonate = 2 * 88 g/mol * 1.292 g/62 g/mol
= 3.51 g
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