3 years ago

Hey pleaseeeeeeeeeeeeeeeeeeeeeeee

Chemistry

2 answers:

charle [14.2K]3 years ago

6 0

Answer: B

Explanation:

Vesnalui [34]3 years ago

5 0

Answer:

Explanation:

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How many grams of MgO are in 3.500 moles?

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Irina-Kira [14]

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A. Changing water from liquid to solid is an example of a physical change

Explanation:

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Water ionizes by the equationH2O(l)⇌H+(aq)+OH−(aq)The extent of the reaction is small in pure water and dilute aqueous solutions

tia_tia [17]

Explanation:

$H_2O(l)\rightleftharpoons H^+(aq)+OH^-(aq)$

The value of $K_w$ :

$K_w=[H^+][OH^-]$

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The sum of pH and pOH is equal to 14.

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$10.49=-\log[H^+]$

$[H^+]=3.2\times 10^{-11}$

$3.2\times 10^{-11} M$ is the $H^+$ concentration for an aqueous solution with pOH = 3.51 at 25°C.

At a certain temperature, the pH of a neutral solution is 7.56.

Neutral solution means that concentration of hydrogen ion and hydroxide ions are equal.

$[H^+]=[OH^-]$

$7.56=-\log[H^+]$

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The value of $K_w$ at at this temperature:

$K_w=[H^+][OH^-]$

$K_w=[H^+][H^+]$

$K_w=(2.754\times 10^{-8})^2=7.6\times 10^{-16}$

The value of $K_w$ at at this temperature is $7.6\times 10^{-16}$ .

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4 years ago

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