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Musya8 [376]
3 years ago
12

How do i find the mole of something?

Chemistry
2 answers:
valkas [14]3 years ago
4 0
You take the mass and divide it by the molar mass
nikklg [1K]3 years ago
3 0
To find the mole of a substance, you take the mass divided by the molar mass of that substance~
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Test is to figure out what we expect and what we have observed.

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A 0.25-mol sample of a weak acid with an unknown Pka was combined with 10.0-mL of 3.00 M KOH, and the resulting solution was dil
Masteriza [31]

Answer : The value of pK_a of the weak acid is, 4.72

Explanation :

First we have to calculate the moles of KOH.

\text{Moles of }KOH=\text{Concentration of }KOH\times \text{Volume of solution}

\text{Moles of }KOH=3.00M\times 10.0mL=30mmol=0.03mol

Now we have to calculate the value of pK_a of the weak acid.

The equilibrium chemical reaction is:

                          HA+KOH\rightleftharpoons HK+H_2O

Initial moles     0.25     0.03        0

At eqm.    (0.25-0.03)   0.03      0.03

                     = 0.22

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[Salt]}{[Acid]}

pH=pK_a+\log \frac{[HK]}{[HA]}

Now put all the given values in this expression, we get:

3.85=pK_a+\log (\frac{0.03}{0.22})

pK_a=4.72

Therefore, the value of pK_a of the weak acid is, 4.72

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Explanation:

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What is the isotopic symbols for <br> Beryllium atom that contains 9 nucleon?
nadya68 [22]

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Beryllium-9 is the isotope of beryllium with relative atomic mass 9.

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