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snow_tiger [21]
3 years ago
15

How many electron shells/orbitals does the element Krypton (Kr) have?

Chemistry
1 answer:
dlinn [17]3 years ago
4 0

Answer:

Krypton has 4 orbital shells

<u>Extra Information:</u>

<em>Krypton has 36 electrons which are arranged in these 4 orbit shells, </em>

<em>The order in which electrons are arranged in these shells is 2,8,18,8</em>

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Be sure to answer all parts. Find the pH during the titration of 20.00 mL of 0.1000 M triethylamine, (CH3CH2)3N (Kb = 5.2 × 10−4
Nataliya [291]

Answer:

(a) 10.62

(b) 2.82

(c) 1.95

Explanation:

The neutralization reaction in this question is

(CH3CH2)3N + HCl   ⇒ (CH3CH2)3NH⁺ + Cl⁻

The problem  can be  solved by calculating the number of moles of triethylamine after  addition of the portions of HCl. Since it is a weak base if it is not consumed completely, that is in excess we will have a buffer of a waek base. If its consumed completely the pH will be determined by the strong acid HCl.

The pOH for a buffer of a weak base is gven by

pOH = pKb + log [(CH3CH2)3NH⁺] / [(CH3CH2)3N]

(a) 11 mL of 0.100 M HCl

mol HCl = 0.011 L x 0.100 mol/L = 0.0011 mol HCl

mol  (CH3CH2)3N reacted = 0.0011 mol

mol (CH3CH2)3NH⁺ produced = 0.0011 mol

mol (CH3CH2)3N  initially = 0.020 L x 0.1000 mol/L 0.0020 mol

mol (CH3CH2)3N left = 0.0020 mol - 0.0011 = 0.0009 mol

pKb = - log Kb = - log (5.2 x 10⁻⁴) = 3.284

Now we can compute pOH,

pOH = 3.284 + log ( 0.0011 / 0.0009 ) = 3.37

pH = 14 - pOH = 14 - 3.37 = 10.62

(b) 20.60 mL HCl

mol HCl = 0.0206 L x 0.100 mol/L = 0.00206

mol  (CH3CH2)3N consumed = 0.0020 mol

This is so  because the acid will consume completely the 0.0020 mol of the weak base  we had originally present.

Now the problem circumscribes to that of calculating the pH of the unreacted HCl

Total Vol = 0.0206 L + 0.02 L = 0.0406 L

mol HCl = 0.0206 L x .100 = 0.00206 mol

mol HCl left = 0.00206 mol - 0.0020 mol = 0.00006 mol

[HCl] = 0.00006 mol / 0.0406 L = 0.0015 M

Since HCl is a strong acid ( 100 % ionization) :

pH = - log [H⁺] = - log ( 0.0015 ) = 2.82

(c) We will compute the pH in  the same way we did for part (b)

mol HCl = 0.025 L x 0.100 mol/L = 0.0025 mol

mol HCl left = 0.0025 mol  - 0.0020 mol = 0.0005

Total Volume = 0.020 L + 0.025 L = 0.045 L

[HCl] = 0.0005 mol / 0.045 L = 0.111

pH = - log ( 0.111) = 1.95                                            

3 0
3 years ago
A certain reaction has an activation energy of 39.5 kJ/mol. As the temperature is increased from 25.0°C to a higher temperature,
riadik2000 [5.3K]

Answer:

Explanation:

We shall apply Arrhenius equation which is given below .

ln\frac{k_2}{k_1} = \frac{E_a}{R} [\frac{1}{T_1} -\frac{1}{T_2} ]

K₂ and K₁ are rate constant at temperature T₂ and T₁ , Ea is activation energy .

Putting the given values

ln\frac{5.9}{1} = \frac{39500}{8.3} [\frac{1}{298} -\frac{1}{T_2} ]

.000373= [\frac{1}{298} -\frac{1}{T_2} ]

T₂ = 335.27 K

= 62.27 °C

4 0
3 years ago
The chemical reaction that occurs when gasoline and air are ignited is called a (n)___.
Nataly [62]

Answer: combustion reaction.


Explanation:


Gasoline is a mixture of hydrocarbons (with some other dded substances in minor proportion).


Assuming a hypothetical composition of the gasoline as C₅H₁₂ (only for explanation purposes), the chemical reaction that occurs when gasoline is burned is represented by:


  • 2C₅H₁₂ + 16O₂  → 10CO₂ + 12H₂O +  energy.

Combustion is a special type of chemical reaction, in which oxygen combines with other substance (element or compound) releasing a large amount of energy in the form of heat and light. It is a very common reaction of the hydrocarbons and the products are carbon dioxide and water in the form of vapor.


The combustion of carbon (C) is a very important and common reaction that has been using to produce energy: C(s) + O₂(g) → CO₂ (g)

3 0
3 years ago
Read 2 more answers
Does in solubility mean it can’t dislove in water
gogolik [260]

Nope, it actually means the exact opposite.

Solubility

the ability to be dissolved, especially in water


- Hope this helps!

5 0
2 years ago
Help with this chemistry problem
xz_007 [3.2K]
  N2  +   3H2  ---->    2NH3

! mole of nitrogen reacts with 3 moles of hydrogen to give 2 moles of ammonia.

So by proportion  number of moles NH3 obtained from 0.60 moles of N2 =

  0.6 *2  = 1.2 moles Answer
6 0
3 years ago
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