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2 years ago

I need help pls be right 20 points!!!

Chemistry

2 answers:

Shtirlitz [24]2 years ago

5 0

Answer:

agribusiness system

Explanation:

Have a good day

thank me later

carryonlearing

iren2701 [21]2 years ago

3 0

Brahhhh it’s a trust meeeeeeee

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A solution prepared by dissolving 0.100 mole of propionic acid in enough water to make 1.00 L of solution is observed to have a

torisob [31]

Answer:

C) $k_a=1.3\times 10^{-5}$

Explanation:

pH is defined as the negative logarithm of the concentration of hydrogen ions.

Thus,

pH = - log [H⁺]

The expression of the pH of the calculation of weak acid is:-

$pH=-log(\sqrt{k_a\times C})$

Where, C is the concentration = 0.5 M

Given, pH = 2.94

Moles = 0.100 moles

Volume = 1.00 L

So, $Molarity=\frac{Moles}{Volume}=\frac{0.100}{1.00}\ M=0.100\ M$

C = 0.100 M

$2.94=-log(\sqrt{k_a\times 0.100})$

$\log _{10}\left(\sqrt{k_a0.1}\right)=-2.94$

$\sqrt{0.1}\sqrt{k_a}=\frac{1}{10^{2.94}}$

$k_a=1.3\times 10^{-5}$

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uysha [10]

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the new volume will be 82×10-3 L or 0.0082 L

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Consider this reaction: 3Fe2O3(s) + CO(g) → 2Fe3O4(s) + CO2(g).

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