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Imagine that you need to determine the molarity of a solution that you prepare by dissolving 11.0g of NaCl in exactly 100mL of solution. A. What info do you have B. What info do you need. C. Determine the molarity of the solution.

Sagot :

CrystalQueen

Answer:

A.) You have been given grams of NaCl (11.0 g) and the volume of the solution (100 mL).

B.) You need to determine the moles of NaCl and the volume of the solution in liters. To find the moles of NaCl , you need to know the molar mass of NaCl.

C.) 1.88 M

Explanation:

To find the molarity of the solution, you need to (1) convert mL to L (by dividing by 1,000), then (2) convert moles NaCl to grams (via molar mass from periodic table), then (3) plug the values into the molarity equation.

Volume = 100 mL / 1,000 = 0.100 L

Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl) = 58.44 g/mol

11.0 g NaCl          1 mole
-----------------  x  ---------------  = 0.188 moles NaCl

                           58.44 g

Molarity = moles / volume

Molarity = 0.188 moles / 0.100 L

Molarity = 1.88 M

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