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If you were to stir salt in water until the salt disappeared, which is the solute?
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6. Chemical Quantities & Aqueous Reactions
Solutions
Multiple Choice
What is the mass percent of KCl in the solution prepared by dissolving 165.0 g of KCl in 275 g of water?
A
60.0%
B
37.5%
C
45.0%
D
25.0%
Verified step by step guidance1
Understand the concept of mass percent: Mass percent is a way of expressing the concentration of a component in a mixture. It is calculated as the mass of the solute divided by the total mass of the solution, multiplied by 100 to get a percentage.
Identify the solute and solvent: In this problem, KCl is the solute, and water is the solvent. You are given the mass of KCl as 165.0 g and the mass of water as 275 g.
Calculate the total mass of the solution: Add the mass of the solute (KCl) to the mass of the solvent (water) to find the total mass of the solution. Use the formula:
Calculate the mass percent of KCl: Use the formula for mass percent:
Substitute the values into the formula: Plug in the mass of KCl and the total mass of the solution into the mass percent formula to find the mass percent of KCl in the solution.
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