How many total miles of ions are released when the following sample dissolves completely in water?
9.99 X 10^20 formula units of FeCl3 =
How many grams of solute are needed to make 379 mL of 6.34 X 10^-2 M potassium sulfate?
Calculate the molarity of a solution prepared by diluting 49.48 mL of 0.559 M potassium chloride to 150.00 mL?
How many total miles of ions are released when the following sample dissolves completely in water?
9.99 X 10^20 formula units of FeCl3 =
So you will have 9.99E20 Fe^3+ ions and 3*9.99E20 Cl^- ions. What is the diameter of Fe^3+? What's the diameter of Cl^-?
Multiply diameter of Fe^3+ by the number of iron ions and add that to the product of the diameter of a chloride ions by number of chloride ions. That will give you the total distance. Convert to miles.Post your work if you get stuck.
How many grams of solute are needed to make 379 mL of 6.34 X 10^-2 M potassium sulfate?
How many formula units do you need? That's M x L = 0.0634 M x 0.379 L = ?
Then grams = formula units x mass of 1 formula unit. Post your work if you get stuck.
Calculate the molarity of a solution prepared by diluting 49.48 mL of 0.559 M potassium chloride to 150.00 mL?
New M = 0.559 M x (49.48 mL/150.00) = ?
Watch the number of significant figures if your prof is picky about that.