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natulia [17]
3 years ago
14

1 i i r 1 X 1 I A mm mm nu. Inchon-Mvim u m an

Chemistry
1 answer:
Setler [38]3 years ago
8 0
The answer is that the pilot was tired of life and committed suicide with hundreds of passengers.
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16.25 g of water at 54 C relaeases 402.7 J. What will be its final temp?
leonid [27]
Data:
Q = 402.7 J → releases → Q = - 402.7 J
m = 16.25 g
T initial = 54 ºC
adopting: c = 4.184J/g/°C
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-5.92^0 =  T_{final} -  54^0
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\boxed{\boxed{T_{final} = 48.08\:^0C}}\end{array}}\qquad\quad\checkmark

8 0
4 years ago
Which of the following 0.300 M solutions would contain the highest concentration of potassium ions?
mojhsa [17]

Here is a list of 0.300 M solutions that you can consider to select which has the highest concetration of potassium ions:

Select one:

a. potassium oxide

b. potassium phosphate

c. potassium hydrogen carbonate

d. potassium hypochlorite

e. potassium iodide

Answer:

  • <em><u>Option b. potassium phosphate</u></em>

Explanation:

First, you must write the chemical formula of each one of the potasssium compounds. Then, assume all the compounds ionize 100%.

Since all the solutions have the same concentrations, by assuming 100% ionization, the ionization equations will show which one produces the highest number of <em>potassium ions</em>, K⁺¹, and that is the solution with the highest concentration of such ions.

<u>1. Chemical formulae</u>

Compound                                              Formula

a. <em>potassium oxide         </em>                          K₂O                                

b. <em>potassium phosphate</em>                          K₃PO₄    

c. <em>potassium hydrogen carbonate</em>          KHPO₃

d. <em>potassium hypochlorite  </em>                     KClO₄

e. <em>potassium iodide     </em>                             KI

<u>2. Dissociation (ionization):</u>

  • a. <em>potassium oxide</em>, K₂O

           K₂O does not dissociate but react with water to product KOH, then KOH dissociates, but there is not such thing as a 0.300 M solution of K₂O.

  • b. <em>potassium phosphate</em>:

       K₃PO₄ → 3K³⁺ + PO₄¹⁻                3 K⁺¹ ions per unit formula

  • c. <em>potassium hydrogen carbonate</em>          

       KHPO₃ →  K⁺¹ + HPO₃⁻¹               1 K⁺¹ ion per unit formula

  • d. <em>potassium hypochlorite </em>                      

        KClO₄ → K⁺¹ + HClO₄⁻¹                1 K⁺¹  ion per unit formula

  • e.<em> potassium iodide</em>                                  

          KI → K⁺¹ + I⁻¹                                1 K⁺¹ ion per unit formula.

Hence, the 0.300 M solution of potasssium phosphate produces the highest concentration of potassium ions.

6 0
3 years ago
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