Multiple Choice
A mass of 0.630 g of NaCl is dissolved in 525 g of water. Calculate the concentration of the salt solution in percent by mass.
14. Solutions
Solutions: Mass Percent
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A solution was prepared by dissolving 51.0 g of KBr in 310 mL of water. Calculate the mass percent of KBr in the solution.
A
16.4%
B
14.1%
C
19.7%
D
0.141%
Verified step by step guidance1
First, calculate the mass of the solution. Since the density of water is approximately 1 g/mL, the mass of 310 mL of water is 310 g. Therefore, the total mass of the solution is the sum of the mass of KBr and the mass of water: 51.0 g + 310 g.
Next, determine the mass percent of KBr in the solution. The mass percent is calculated using the formula: \( \text{Mass percent} = \left( \frac{\text{mass of solute}}{\text{mass of solution}} \right) \times 100 \% \).
Substitute the known values into the formula: \( \text{Mass percent} = \left( \frac{51.0 \text{ g}}{\text{total mass of solution}} \right) \times 100 \% \).
Calculate the total mass of the solution by adding the mass of KBr and the mass of water: \( 51.0 \text{ g} + 310 \text{ g} = 361.0 \text{ g} \).
Finally, substitute the total mass of the solution into the mass percent formula to find the mass percent of KBr: \( \text{Mass percent} = \left( \frac{51.0}{361.0} \right) \times 100 \% \).
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