Chemistry Practice Problems Molarity Practice Problems Solution: A chemist prepares a solution of aluminum chloride...

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Solution: A chemist prepares a solution of aluminum chloride (AICI 3) by measuring out 24.6 g of aluminum chloride into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's aluminum chloride solution. Be sure your answer has the correct number of significant digits.

Problem

A chemist prepares a solution of aluminum chloride (AICI 3) by measuring out 24.6 g of aluminum chloride into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's aluminum chloride solution. Be sure your answer has the correct number of significant digits.


Solution

Molarity can be calculated as:

For this problem, we are given the mass of AlCl3, we can calculate the moles by using its molar mass which is:

MM of AlCl3:

Al - 26.98 (1) = 26.98

Cl - 35.45 (3) = 106.36

26.98 + 106.35 = 133.34 g/mol

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