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Irina-Kira [14]
2 years ago
8

Some chemical reactions take a very long time to go to completion or cannot be directly measured. Which law allows one to use tw

o or more thermochemical equations to
calculate the heat of a reaction indirectly?
-Pascal's Principle
-Hess's law of heat production
-Hess's law of heat division
-Hess's law of heat summation
Chemistry
1 answer:
katrin2010 [14]2 years ago
7 0

Answer:

D

Explanation:

If you add two or more thermochemical equations to give a final equation, then you also add the heats of reaction to give the final heat of reaction

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If one adds 0.1 mol of the weak acid hf (pk_a = 3.2) to a solution with a ph = 2, which species would be most abundant and how m
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F^{-} is most abundant and 6310 times more than HF.

<h3>What is a strong and weak acid?</h3>

When an acid is dissolved in water, all of its molecules disintegrate, making the acid powerful.

When an acid is dissolved in water, only a small number of its molecules disintegrate, making the acid weak. Strong acids have a lower pH than weak acids.

The powerful acids include perchloric acid, chloric acid, nitric acid, sulfuric acid, hydrobromic acid, and hydroiodic acid.

Given:

Pka=3..2

pH=7

Let the volume be 1 liter

[HF]=01 M

pH=pka+log \frac{F^{-}}{HF} \\\\7=3.2+log\frac{F^{-}}{HF} \\3.8=log\frac{F^{-}}{HF}\\ \frac{F^{-}}{0.1}=10^{3.8} \\F^{-}=630.95 M

Now,

\frac{F^{-}}{HF}=\frac{630.95}{0.1}\\ =6309.57

F-:HF= 6309.57:1

Therefore, the most abundant is F^{-}and has 6310 times more than HF is F^{-}.

To know more about strong and weak acids, visit: brainly.com/question/12811944

#SPJ4

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\\ \sf{:}\longrightarrow 2,4-diethyl-2-methylpentane

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