A student adds 3 spoons of a solid to 100 mL of water. The solution is clear, with nothing on the bottom of the cup. One spoon of the solid has a mass of 5 g.
I don't mind helping to find answers, but I resent having to provide the questions as well.
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To determine the concentration of the solution, we need to calculate the amount of solute (solid) dissolved in the solvent (water).
First, we need to find the total mass of the solid added to the solution. Since each spoon of the solid has a mass of 5 grams, and the student added 3 spoons, the total mass of the solid is 5 grams/spoon * 3 spoons = 15 grams.
Now, we can calculate the concentration by dividing the mass of the solid by the volume of the solution: concentration = mass/volume.
The volume of the solution is given as 100 mL, but it's important to convert this to liters since the concentration is usually expressed in units of grams per liter (g/L). There are 1000 mL in 1 liter, so 100 mL is equal to 100 mL/1000 mL/L = 0.1 L.
Finally, we can calculate the concentration: concentration = 15 g / 0.1 L = 150 g/L.
Therefore, the concentration of the solution is 150 grams per liter (g/L).