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Kipish [7]
3 years ago
14

Calculate the molarity of 80.0 ml of a solution that is 0.92 % by mass nacl. assume the density of the solution is the same as p

ure water.
Chemistry
1 answer:
Sav [38]3 years ago
6 0

<span>We are given the volume of the solution which is 80 mL or 0.08 L and the density which is equal to water, density = 1 kg / L.  Therefore calculate total mass:</span>

total mass = (1 kg / L) * (0.08 L) = 0.08 kg = 80 g

 

So the mass of NaCl is:

mass NaCl = 0.0092 * 80 g = 0.736 g

The molar mass of NaCl is 58.44 g/mol, so the number of moles is:

moles NaCl = 0.736 g / (58.44 g/mol) = 0.0126 mol

 

SO the molarity is mol / L:

<span>Molarity = 0.0126 mol / 0.08 L = 0.157 mol/L = 0.157 M</span>

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Suppose you need to prepare 136.9 mL of a 0.315 M aqueous solution of NaCl.
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Explanation:

(Step 1)

To find the mass, you first need to find the moles NaCl. This value can be found using the molarity ratio:

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After you convert mL to L, you can plug the given values into the equation and simplify to find moles.

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Now, you can use the molar mass to convert moles to grams.

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0.0431 moles NaCl           58.443 g
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