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sammy [17]
3 years ago
8

Which of the following statements about the formation of a solution is true? A. An ionic compound cannot dissolve when a molecul

ar compound acts as the solvent.. B. Dissolution is a chemical change.. C. Dissolution is associated with heat change.. D. Water is a good solvent for C6H6.
Chemistry
1 answer:
Assoli18 [71]3 years ago
4 0
C. Dissolution is associated with heat change.
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How many moles of hydrogen gas would be required to produce 25 moles of H2O?
OverLord2011 [107]

Answer:

There would be 25 moles

Explanation:

This is the equation for water (synthesis):

2H₂   +   O₂   →    2H₂O

Since there are 25 moles of water, the moles of hydrogen gas will have 25 moles.

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Complete the sentence: Cellular respiration occurs ________________.
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3 years ago
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Consider the insoluble compound silver bromide , AgBr . The silver ion also forms a complex with ammonia . Write a balanced net
Degger [83]

Answer:

- AgBr(s)+2NH_3(aq)\rightleftharpoons Ag(NH_3)_2^+(aq)+Br^-(aq)

- K=1.2x10^{-5}

Explanation:

Hello,

In this case, by considering the dissolution of silver bromide:

AgBr(s)\rightleftharpoons Ag^+(aq)+Br^-(aq) \ \ \ Ksp=[Ag^+][Br^-]=7.7x10^{-13}

And the formation of the complex:

Ag^+(aq)+2NH_3(aq)\rightleftharpoons Ag(NH_3)_2^+(aq)\ \ \ Kf=\frac{[Ag(NH_3)_2^+]}{[Ag^+][NH_3]^2}=1.6x10^7

We obtain the balanced net ionic equation by adding the aforementioned equations:

AgBr(s)+Ag^+(aq)+2NH_3(aq)\rightleftharpoons Ag(NH_3)_2^+(aq)+Br^-(aq)+Ag^+(aq)\\\\AgBr(s)+2NH_3(aq)\rightleftharpoons Ag(NH_3)_2^+(aq)+Br^-(aq)

Now, the equilibrium constant is obtained by writing the law of mass action for the non-simplified net ionic equation:

AgBr(s)+Ag^+(aq)+2NH_3(aq)\rightleftharpoons Ag(NH_3)_2^+(aq)+Br^-+Ag^+\\\\K=[Ag^+][Br^-]*\frac{[Ag(NH_3)_2^+]}{[Ag^+][NH_3]^2}

So we notice that the equilibrium constant contains the solubility constant and formation constant for the initial reactions:

K=Ksp*Kf=7.7x10^{-13}*1.6x10^{7}\\\\K=1.2x10^{-5}

Best regards.

4 0
3 years ago
10 points
Oduvanchick [21]

Answer:

table C will be the correct answer

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All atoms of uranium have the same
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