Calculate the number of moles of solute present in each of the following aqueous solutions: (b) 86.4 g of 0.180 m KCl,

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 units of moles per liter (mol/L). Understanding molarity is essential for calculating the amount of solute in a given volume of solution, which is crucial for solving the problem presented.

Moles of Solute

A mole is a unit in chemistry that represents 6.022 x 10²³ particles (atoms, molecules, etc.). To find the number of moles of solute in a solution, one can use the formula: moles = molarity × volume. This concept is vital for determining how much solute is present in the solution based on its concentration and volume.

Mass and Molar Mass

The mass of a substance is the amount of matter it contains, typically measured in grams. Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). To calculate the number of moles from a given mass, the formula used is: moles = mass (g) / molar mass (g/mol). This relationship is key to solving the problem regarding the amount of KCl in the solution.