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3 years ago

PLEASE HELP ME! The question is on the image! It’s about the mole

Chemistry

1 answer:

garri49 [273]3 years ago

6 0

Ok the answer is the

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As electrons gain more energy they can move ____ away from the nucleus

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3 years ago

Identify each property below as more characteristic of a metal or a nonmetal.

Romashka [77]

A. Nonmetallic
B. Nonmetallic
C. Metallic
D. Nonmetallic
E. Metallic

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3 years ago

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spayn [35]

Answer:

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Explanation:

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3 years ago

Did democritus belive atoms retain there identity as a chemical reaction

mihalych1998 [28]

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3 years ago

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The solubility product of PbI2 is 7.9x10^-9. What is the molar solubility of PbI2 in distilled water?

Agata [3.3K]

<u>Answer:</u> The molar solubility of $PbI_2$ is $1.25\times 10^{-3}mol/L$

<u>Explanation:</u>

Solubility is defined as the maximum amount of solute that can be dissolved in a solvent at equilibrium.

Solubility product is defined as the product of concentration of ions present in a solution each raised to the power its stoichiometric ratio.

The balanced equilibrium reaction for the ionization of calcium fluoride follows:

$PbI_2\rightleftharpoons Pb^{2+}+2I^-$

s 2s

The expression for solubility constant for this reaction will be:

$K_{sp}=[Pb^{2+}][I^-]^2$

We are given:

$K_{sp}=7.9\times 10^{-9}$

Putting values in above equation, we get:

$7.9\times 10^{-9}=(s)\times (2s)^2\\\\7.9\times 10^{-9}=4s^3\\\\s=1.25\times 10^{-3}mol/L$

Hence, the molar solubility of $PbI_2$ is $1.25\times 10^{-3}mol/L$

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3 years ago