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Annette [7]
3 years ago
7

You give a sample containing .90 moles of a substance

Chemistry
1 answer:
vampirchik [111]3 years ago
3 0
1 mole Cu ------------------ 6.02x10²³ atoms
0.90 moles Cu ------------ ??

0.90 x ( 6.02x10²³ ) / 1 =

= 5.41x10²³ atoms


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The acetic acid/acetate buffer system is a common buffer used in the laboratory. Write the equilibrium equation for the acetic a
hichkok12 [17]

Answer:

CH₃CO₂H + H₂O ⇄ CH₃CO₂⁻ + H₃O⁺

Explanation:

A buffer is defined as the mixture of a weak acid and its conjugate base or vice versa.

For the acetic acid buffer, CH₃CO₂H is the weak acid and its conjugate base is the ion without H⁺, that is CH₃CO₂⁻. The equilibrium equation in water knowing this is:

<h3>CH₃CO₂H + H₂O ⇄ CH₃CO₂⁻ + H₃O⁺</h3>

<em>In the equilibrium, the acid is dissociated in the conjugate base and the hydronium ion.</em>

8 0
3 years ago
The movement of broken down pieces of rock from one place to another is called
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Answer:

The answer I believe is B. Erosion

Explanation:

Just sounds better than all the other choices.

7 0
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Define the term relative atomic mass, A.
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The mass of an atom and the equivalent of to the number of protons and neutrons in the atom
6 0
3 years ago
Consider the insoluble compound nickel(II) hydroxide , Ni(OH)2 . The nickel ion also forms a complex with cyanide ions . Write a
natali 33 [55]

Answer: Equilibrium constant for this reaction is 2.8 \times 10^{15}.

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Chemical reaction equation for the formation of nickel cyanide complex is as follows.

Ni(OH)_{2}(s) + 4CN^{-}(aq) \rightleftharpoons [Ni(CN)_{4}^{2-}](aq) + 2OH^{-}(aq)

We know that,

      K = K_{f} \times K_{sp}

We are given that, K_{f} = 1.0 \times 10^{31}

and,    K_{sp} = 2.8 \times 10^{-16}

Hence, we will calculate the value of K as follows.

     K = K_{f} \times K_{sp}

     K = (1.0 \times 10^{31}) \times (2.8 \times 10^{-16})

        = 2.8 \times 10^{15}

Thus, we can conclude that equilibrium constant for this reaction is 2.8 \times 10^{15}.

4 0
3 years ago
which of the following describes something an engineer would probably do first when developing new technology meant to reduce oc
JulijaS [17]

Answer:

Option B. is the right answer.

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3 0
3 years ago
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