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A chemist prepares a solution by adding 448 mg of Co(NO3)2 (MW = 182.94 g/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 500 mL . Determine the molarity of the prepared solution.

Respuesta :

Answer:

Molarity of solution is 0.0049 M

Explanation:

Molarity of a solution is the ratio of number of moles of solute to volume of solution in Liter

Number of moles is the ratio of mass to molecular weight of a compound.

Here [tex]Co(NO_{3})_{2}[/tex] is the solute.

448 mg of [tex]Co(NO_{3})_{2}[/tex] = 0.448 g of [tex]Co(NO_{3})_{2}[/tex]

So, 0.448 g of [tex]Co(NO_{3})_{2}[/tex] = [tex]\frac{0.448}{182.94}[/tex] moles of [tex]Co(NO_{3})_{2}[/tex] = 0.00245 moles of [tex]Co(NO_{3})_{2}[/tex]

Total volume of solution = 500 mL = 0.5 L

So, molarity of solution  = [tex]\frac{0.00245}{0.5}M=0.0049 M[/tex]

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