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2 years ago

10

Would someone mind helping me? I really need this answer but I'm so confused. I would appreciate any help :) and if you get the

answer right, ill give you brainliest.

2 answers:

Svetllana [295]2 years ago

7 0

Answer:

A

Explanation:

liquids thake the shape of what holds them so shape is changing and volume is the same

iogann1982 [59]2 years ago

6 0

Your answer would be letter A!! goodluck with your quiz ig

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2al2o3 4al 3o2 what is the mole ra#tio of aluminum to oxygen is 4:3

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In the reaction represented by the equation 2Al2O3-->4Al+3O2, what is the mole ratio of aluminum to oxygen?

4:3

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2 years ago

Be sure to answer all parts. What is the [H3O+] and the pH of a buffer that consists of 0.26 M HNO2 and 0.89 M KNO2? (K, of HNO2

Aleksandr-060686 [28]

Answer : The $H_3O^+$ ion concentration is, $1.12\times 10^{-3}M$ and the pH of a buffer is, 2.95

Explanation : Given,

$K_a=7.1\times 10^{-4}$

Concentration of $HNO_2$ (weak acid)= 0.26 M

Concentration of $KNO_2$ (conjugate base or salt)= 0.89 M

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (7.1\times 10^{-4})$

$pK_a=4-\log (7.1)$

$pK_a=3.15$

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

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

$pH=pK_a+\log \frac{[KNO_2]}{[HNO_2]}$

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

$pH=3.15+\log (\frac{0.89}{0.26})$

$pH=2.95$

The pH of a buffer is, 2.95

Now we have to calculate the $H_3O^+$ ion concentration.

$pH=-\log [H_3O^+]$

$2.95=-\log [H_3O^+]$

$[H_3O^+]=1.12\times 10^{-3}M$

The $H_3O^+$ ion concentration is, $1.12\times 10^{-3}M$

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2 years ago

How does the DNA of a daughter cell compare to the DNA of the parent cell in asexual reproduction?

Rufina [12.5K]

Answer:

The Answer is B

Explanation:

I hope this helps ;)

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2 years ago

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Dafna11 [192]

Answer:

You can

Explanation:

The concentration doesn't change when its equals out.

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3 years ago

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3 years ago

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