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Otrada [13]
3 years ago
13

What makes up an isotope’s mass number?

Chemistry
1 answer:
Lisa [10]3 years ago
3 0

Answer:

A

Explanation:

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If the pH of a solution is 7.6, what is the pOH? A. 6.4 B. 8.4 C. 5.4 D. 7.4
maks197457 [2]

Answer:

6.4

 

Explanation:  pH

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pOH

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pH

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7.6

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pOH

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Explanation:

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At equal concentrations would a nonelectrolyte (e.g. glucose) or electrolyte (e.g. nacl) containing solution have a lower freezi
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Answer is: solution of electrolyte will have lower freezing point than solution of nonelectrolyte.
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3 years ago
You have a 100 ml stock solution of 100 mg/ml ampicillin in deionized water. You want to make 30 ml of 25 mg/ml ampicillin in de
Georgia [21]

Explanation:

Volume of the stock solution is V_{1} = ?

Initial concentration of ampicillin is M_{1} = 100 mg/ml

Final volume (V_{2}) = 30 ml

Final concentration of  ampicillin (M_{2}) = 25 mg/ml

Therefore, calculate the volume of given stock 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}

            100 mg/ml \times V_{1} = 25 g/ml \times 30 ml    

                   V_{1} = 7.5 ml

Now, we will calculate the volume of water added into it as follows.

            Volume of water added = V_{2} - V_{1}

                                                  = 30 ml - 7.5 ml

                                                  = 22.5 ml

Thus, we can conclude that required solution is 22.5 ml of deionized water.

3 0
3 years ago
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