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gogolik [260]
3 years ago
8

What is the molarity when 20 grams of LiOH is added to 200 mL of water?​

Chemistry
1 answer:
tensa zangetsu [6.8K]3 years ago
6 0

Answer:

4.15mol/dm³

Explanation:

Given:

Mass of LiOH = 20g

Volume of water = 200mL

Unkown:

Molarity of the solution =?

Solution:

Molarity is defined as the number of moles of a given solute in a volume of solution.

     Molarity = \frac{Number of moles of LiOH}{Volume of solution}

We don't know the number of moles of LiOH,

  Number of moles of LiOH =  \frac{mass}{molar mass}

Molar mass of LiOH = 7 + 16 + 1 = 24g/mol

 Number of moles of LiOH = \frac{20}{24} = 0.83mole

   

Note:

    1000mL = 1dm³

     200mL gives 0.2dm³ of the water.

Molarity = \frac{0.83}{0.2} = 4.15mol/dm³

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