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During a water treatment program, 127 grams of calcium nitrate, Ca(NO3)2, is dissolved in water. The final volume of the solution is 2,300 milliliters. What is the molarity of the solution?

Refer to the periodic table to help you answer. Express your answer to two significant figures.

The molarity of the solution is
M.

Respuesta :

Answer:- 0.34 M

Solution:- 127 grams of calcium nitrate are dissolved in water to make the volume of the solution 2300 mL. It asks to calculate the molarity of the solution.

Molarity is moles of solute per liter of solution. let's convert the given grams of the solute to moles on dividing it's grams by molar mass and convert the mL to L . Then the moles are divided by the liters to get the molarity. M is the symbol for molarity.

Calcium nitrate contains one Ca, two N and six O.  The molar mass is calculated as:

Molar mass = 40.078 + 2(14.007) + 6(15.999)

= 40.078 + 28.014 + 95.994

= 164.086 grams per mol

Conversion of grams to moles:

[tex]127g(\frac{1mol}{164.086g})[/tex]

= 0.774 mol

Conversion of mL to L:

[tex]2300mL(\frac{1L}{1000mL})[/tex]

= 2.3 L

Now, divide the moles by liters to get the molarity:

Molarity = [tex]\frac{0.774mol}{2.3L}[/tex]  = 0.34 M

So, the molarity of calcium nitrate solution is 0.34 M.

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