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Triss [41]
3 years ago
15

Which one is the answer... a, b, or c?

Chemistry
1 answer:
jenyasd209 [6]3 years ago
8 0
The answer for this one is a
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Copper(I) ions in aqueous solution react with NH 3 ( aq ) according to Cu + ( aq ) + 2 NH 3 ( aq ) ⟶ Cu ( NH 3 ) + 2 ( aq ) K f
Kruka [31]

Answer:

53.18 gL⁻¹

Explanation:

Given that:

Cu^{2+}_{(aq)} + 2NH_{3(aq)} ------>  [Cu(NH_3)_2]^+_{(aq)}      ------equation (1)

where;

Formation Constant  (k_f) = 6.3*10^{10}

However, the Dissociation of CuBr_{(s) yields:

CuBr_{(s)}      ⇄    Cu^{+}_{(aq)}  + Br^-_{(aq)}      -------------- equation (2)

where;

the Solubility Constant (k_{sp})  = 6.3 *10^{-9

From equation (1);

(k_f) = \frac{[[Cu(NH_3)_2]^+]}{[Cu^{2+}][NH_3]^{2}}            ---------  equation (3)

From equation (2)

(k_{sp})  = [Cu^+][Br^-]           ---------  equation (4)

In NH_3, the net reaction for CuBr_{(s) can be illustrated as:

CuBr_{(s)   + 2NH_{3(aq)}  ⇄  [Cu(NH_3)_2]^+_{(aq)}  + Br^-_{(aq)}

The equilibrium constant (K) can be written as :

K=\frac{[[Cu(NH_3)_2]^+][Br^-]}{[NH_3]^2}

If we multiply both the numerator and the denominator with  [Cu^+] ; we have:

K=\frac{[[Cu(NH_3)_2]^+][Br^-]}{[NH_3]^2}*\frac{[Cu^+]}{[Cu^+]}

K=\frac{[[Cu(NH_3)_2]^+}{[NH_3]^2[Cu^+]}*{[Cu^+][Br^-]}

K = k_f *k_{sp}

K= (6.3*10^{10})*(6.3*10^{-9})

K= 3.97*10^2

K ≅ 4.0*10^2

Now; we can re-write our equilibrium constant again as:

K=\frac{[[Cu(NH_3)_2]^+][Br^-]}{[NH_3]^2}

4.0*10^2 = \frac{(x)(x)}{(0.76-2x)^2}

4.0*10^2 = \frac{(x)^2}{(0.76-2x)^2}

4.0*10^2 = (\frac{(x)}{(0.76-2x)})^2

By finding the square of both sides, we have

\sqrt {4.0*10^2} = \sqrt {(\frac{(x)}{(0.76-2x)})^2

2.0*10 = \frac{x}{(0.76-2x)}

20(0.76-2x) =x

15.2 -40x=x

15.2 = 40x +x

15.2 = 41x

x = \frac{15.2}{41}

x = 0.3707 M

In gL⁻¹; the solubility of CuBr_{(s) in 0.76 M NH_3 solution will be:

= \frac{0.3707 mole of CuBr}{1L}*\frac{143.45 g}{mole of CuBr}

=  53.18 gL⁻¹

4 0
3 years ago
What is the majority of the atom composed of *TWO WORD ANSWER* ANSWER ASAP WILL AWARD BRAINLIEST! SCAM ANSWERS WILL BE REPORTED
Olin [163]

Answer:

Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature..

Explanation:

Hope it helps you..

Y-your welcome in advance..

(;ŏ﹏ŏ)(ㆁωㆁ)

6 0
3 years ago
Fill in the missing blanks in the equation below active enzyme
Anni [7]
There is no equation
4 0
3 years ago
Scientific knowledge can withstand the test of time because A. exceptions can be made regarding scientific laws. B. it is open t
Iteru [2.4K]

B. It is open to change as new evidence or data is discovered. If scientists discover new evidence, they must modify their theories to conform with the new data.

A. is <em>incorrect</em>. Scientific laws are so well established that there can be no exceptions.

C. is <em>incorrect</em>. A scientific theory is the collective judgement of scientists as to the best explanation for a phenomenon. A new observation may require modification of the theory.

D. is <em>incorrect</em>. Advancements in technology can provide new evidence that requires new explanations.

5 0
3 years ago
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Korolek [52]

Answer:

1. a part of the soil that contains decayed plant or animal matter

2. erosion

3. topsoil

Explanation:

Hope this helped :)

6 0
3 years ago
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