Join thousands of students who trust us to help them ace their exams!Watch the first video
Multiple Choice
Sucrose has a molecular mass of 342 daltons. To make a 2-molar (2 M) solution of sucrose, __________.
A
stir 342 g of sucrose in water to dissolve the sugar, and then add enough water to bring the total volume of the solution to 1 L
B
stir 684 g of sucrose in water to dissolve the sugar, and then add enough water to bring the total volume of the solution up to 2 L
C
stir 684 g of sucrose in water to dissolve the sugar, and then add enough water to bring the total volume of the solution up to 0.5 L
D
stir 342 g of sucrose in water to dissolve the sugar, and then add enough water to bring the total volume of the solution up to 0.5 L
Verified step by step guidance
1
Understand the concept of molarity: Molarity (M) is defined as the number of moles of solute per liter of solution. It is expressed as M = moles of solute / liters of solution.
Calculate the number of moles needed for a 2 M solution: Since the problem asks for a 2 M solution, you need 2 moles of sucrose per liter of solution.
Determine the mass of sucrose needed for 2 moles: The molecular mass of sucrose is given as 342 daltons (or grams per mole). Therefore, 2 moles of sucrose would weigh 2 * 342 g.
Consider the volume of the solution: To make a 2 M solution, the total volume of the solution should be 1 liter. This means you dissolve the calculated mass of sucrose in water and then add enough water to reach a total volume of 1 liter.
Apply the calculations to the options: Based on the calculations, the correct procedure involves using 684 g of sucrose (2 moles) and bringing the total volume to 1 liter to achieve a 2 M solution.