Multiple Choice
What is the molarity of a solution containing 1.22 mol of KI dissolved in 1.15 L of solution?
6. Chemical Quantities & Aqueous Reactions
Molarity
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How many moles of CaSO4 are present in 50.0 mL of 0.250 M CaSO4 solution?
A
0.0125 moles
B
0.0250 moles
C
0.1000 moles
D
0.0500 moles
Verified step by step guidance1
Understand that molarity (M) is defined as moles of solute per liter of solution. The formula to find moles from molarity is: \( \text{moles} = \text{Molarity} \times \text{Volume in Liters} \).
Convert the volume from milliliters to liters. Since there are 1000 milliliters in a liter, divide the given volume (50.0 mL) by 1000 to convert it to liters.
Substitute the given values into the formula: use the molarity of the solution (0.250 M) and the converted volume in liters.
Calculate the number of moles by multiplying the molarity by the volume in liters.
Review the calculation to ensure that the units cancel appropriately, leaving you with moles as the final unit.
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