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scoundrel [369]

3 years ago

7

Greenhouse gases make up what percentage of Earth's atmosphere? A. less than 1% B. between 1% and 5% C. between 5% and 20% D. ov

er 20%

2 answers:

Andrew [12]3 years ago

7 0

The correct answer is C

Dmitrij [34]3 years ago

3 0

Hello there, the correct answer is:

C.

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In the laboratory, a general chemistry student measured the pH of a 0.529 M aqueous solution of phenol (a weak acid), C6H5OH to

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The dissociation constant of phenol from given information is $9.34\times 10^{-11}$ .

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Initially c

At eq'm c-x x x

The expression of dissociation constant is given as:

$K_a=\frac{[C_6H_5O^-][H^+]}{[C_6H_5OOH]}$

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$5.153=-\log[x]$

$x=7.03\times 10^{-6} M$

$K_a=\frac{x\times x}{(c-x)}=\frac{x^2}{(c-x)}=\frac{(7.03\times 10^{-6} M)^2}{ 0.529 M-7.03\times 10^{-6} M}$

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The dissociation constant of phenol from given information is $9.34\times 10^{-11}$ .

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