Multiple Choice
Wine contains 13.5% v/v of ethanol (C2H5OH). What is the molarity of ethanol in wine if the density of ethanol is 0.785 g/mL?
6. Chemical Quantities & Aqueous Reactions
Molarity
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How do you calculate the molarity of a solution?
A
Multiply the moles of solute by the volume of solution in liters.
B
Multiply the mass of solute by the volume of solution in milliliters.
C
Divide the mass of solute by the volume of solution in milliliters.
D
Divide the moles of solute by the volume of solution in liters.
Verified step by step guidance1
Understand that molarity (M) is defined as the number of moles of solute per liter of solution. It is a measure of the concentration of a solute in a solution.
Identify the formula for molarity: \( M = \frac{\text{moles of solute}}{\text{volume of solution in liters}} \). This formula shows that molarity is calculated by dividing the moles of solute by the volume of the solution in liters.
To find the moles of solute, you may need to use the molar mass of the solute if you are given the mass. The formula to convert mass to moles is: \( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \).
Ensure that the volume of the solution is in liters. If the volume is given in milliliters, convert it to liters by dividing by 1000, since 1 liter = 1000 milliliters.
Substitute the values of moles of solute and volume of solution into the molarity formula to calculate the molarity of the solution.
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