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2 years ago

Which of the following is a statement of Hess's law?

Chemistry

2 answers:

amid [387]2 years ago

5 0

Answer:

Letter C...........................

Explanation:

Letter C

Alenkinab [10]2 years ago

5 0

Answer:

D) The enthalpy of reaction does not depend on the steps taken in the reaction.

Explanation:

In my study guide, it says, "Hess's law states that the enthalpy of a reaction does not depend on the path."

hope this helps~

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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

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

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$HA+KOH\rightleftharpoons HK+H_2O$

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:

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$pK_a=4.72$

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