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efox Fle iew History s lools indow Help || Start Cone Isea succossx Master's Degree Program n PORn (15)Facebook x/ AALEKS.Tymor Aboion-Leo + x CHEMICAL REACTIONS Calculating molarity using solute mass A chemist prepares a solution of barium chloride (BaC12) by measuring out 87. g of barium chloride into a 500. ml, volumetric flask and filling the flask to the mark with water Calculate the concentration in mol/L of the chemist's barium chloride solution. Be sure your answer has the correct number of significant digits. moVL Explanation Check

Explanation / Answer

We shall need the atomic masses of Ba and Cl.

Ba = 137.327 g/mol

Cl = 35.453 g/mol

Molar mass of barium chloride, BaCl2 = (1*137.327 + 2*35.453) g/mol = 208.233 g/mol.

Mole(s) of BaCl2 corresponding to 87 g = (87 g)*(1 mole/208.233 g) = 0.4178 mole.

The said mole(s) of BaCl2 are dissolved in 500 mL water; hence, the concentration of BaCl2 = (moles of BaCl2)/(volume of solution in L) = (0.4178 mole)/[(500 mL)*(1 L/1000 mL)] = 0.8356 mol/L 0.83 mol/L (we will assume that the volume of the solution is equal to the volume of water added, since BaCl2 is a solid and we assume the volume of the solution to be not affected by the volume of BaCl2) (ans).

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