If 50 g of KCl is dissolved in 250 mL of solution, what is the molarity? (Molar

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Question: If 50 g of KCl is dissolved in 250 mL of solution, what is the molarity? (Molar mass of KCl = 74.5 g/mol)

Options:

Correct Answer: 1.34 M

Solution:

Moles of KCl = 50 g / 74.5 g/mol = 0.672 moles. Molarity = 0.672 moles / 0.25 L = 2.688 M.

If 50 g of KCl is dissolved in 250 mL of solution, what is the molarity? (Molar mass of KCl = 74.5 g/mol)

If 50 g of KCl is dissolved in 250 mL of solution, what is the molarity? (Molar mass of KCl = 74.5 g/mol)

Step 1: Find the molar mass of KCl, which is given as 74.5 g/mol.
Step 2: Calculate the number of moles of KCl by dividing the mass of KCl (50 g) by its molar mass (74.5 g/mol).
Step 3: Use the formula: Moles of KCl = 50 g / 74.5 g/mol.
Step 4: Perform the calculation: 50 g / 74.5 g/mol = 0.672 moles.
Step 5: Convert the volume of the solution from mL to L. Since 250 mL = 0.25 L.
Step 6: Calculate the molarity using the formula: Molarity = moles of solute / liters of solution.
Step 7: Substitute the values: Molarity = 0.672 moles / 0.25 L.
Step 8: Perform the calculation: 0.672 moles / 0.25 L = 2.688 M.

Molarity Calculation – Molarity is calculated by dividing the number of moles of solute by the volume of solution in liters.
Moles Calculation – To find moles, divide the mass of the solute by its molar mass.
Unit Conversion – Understanding the conversion from grams to moles and milliliters to liters is essential for accurate calculations.