How many grams of KCl are needed to create 1.5 liters of a 3M solution?

To determine the number of grams of KCl required to create a 1.5-liter solution at a concentration of 3M, you'll need to follow these steps:

First, the molarity (M) of a solution is defined as the number of moles of solute per liter of solution. Therefore, a 3M solution means there are 3 moles of KCl in every liter of solution.

Next, calculate the total number of moles needed for 1.5 liters of a 3M solution: 3 moles/liter × 1.5 liters = 4.5 moles of KCl.

Now, you must convert moles into grams. The molar mass of KCl can be calculated using the atomic masses of potassium (K) and chlorine (Cl). Potassium has an atomic mass of approximately 39.1 g/mol, and chlorine has an atomic mass of about 35.5 g/mol. Therefore, the molar mass of KCl is: 39.1 g/mol + 35.5 g/mol = 74.6 g/mol.

Now, multiply the number of moles by the molar mass to find the total grams: 4.5 moles ×