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s344n2d4d5 [400]
3 years ago
8

Approximately ____ percent of intellectual disability cases can be attributed to known biological abnormalities.

Biology
2 answers:
Drupady [299]3 years ago
4 0
The answer is C. 50 percent
IrinaVladis [17]3 years ago
3 0
C.


I hope this helps and have a wonderful day filled with joy!

<3
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How much 3M NaOH (MW=40) can be made from 10.0mL of a 10M solution?
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Explanation:

The given data is as follows.

              M_{1} = 3 M,           V_{1} = ?

              M_{2} = 10 M,         V_{2} = 10.0 ml

Therefore, calculate the volume of given solution as follows.

              M_{1} \times V_{1} = M_{2} \times V_{2}

Now, putting the given values into the above formula as follows.

            M_{1} \times V_{1} = M_{2} \times V_{2}

            3 M \times V_{1} = 10 M \times 10.0 ml    

                   V_{1} = 33.3 ml

or,                             = 0.033 L        (as 1 ml = 0.001 L)

Since, molarity of NaOH is given as 3 M and its volume is calculated as 33.3 ml.

           Molarity = \frac{\text{mass of solute}}{\text{molar mass of solute}} \times \frac{1}{\text{volume in L}}

               3 M = \frac{mass}{40 g/mol \times 0.033 L}

              mass = 3.96 g

Therefore, we can conclude that mass of NaOH is 3.96 g.

8 0
3 years ago
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