How many grams of solute would you use to prepare each of the following solutions? (a) 250.0 mL of 0.600 M ethyl alcohol (C₂H₆O)

Key Concepts

Molarity (M)

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in moles per liter (mol/L). To calculate the amount of solute needed for a solution, you can use the formula: Molarity (M) = moles of solute / volume of solution in liters.

Moles of Solute

A mole is a unit in chemistry that represents 6.022 x 10²³ entities, such as atoms or molecules. To find the number of moles of solute required for a solution, you can rearrange the molarity formula: moles of solute = Molarity (M) × volume of solution (L). This calculation is essential for determining how much solute to weigh out.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule. Knowing the molar mass of the solute allows you to convert moles of solute into grams, which is necessary for preparing a solution.