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Ilya [14]
3 years ago
11

What is the electron configuration of an element with atomic number 15 ? Please help

Chemistry
2 answers:
crimeas [40]3 years ago
7 0
If the atomic number is 15, this means this is element P in the periodic table.

the electron configuration is:

[P]= 1S^22S^22P^63S^23P^3


Travka [436]3 years ago
7 0
Here is the explanation. Good luck.

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20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M aqueous HCl. Which indicator
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Answer:

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

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Explanation:

The equation for the reaction is :

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number of moles = 10 / 45.08

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Molarity of C_2H_5NH_2(aq) = 0.222 \times \frac{1000}{100}mL

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number of moles of C_2H_5NH_{2(aq) in 20 mL can be determined as:

= 20 mL \times  2.22 M= 44*10^{-3} mole

Concentration of C_2H_5NH_2(aq) = \frac{44*10^{-3}*1000}{20}

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Similarly, The pKa Value of C_2H_5NH_{2(aq) is given as 10.75

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pH = \frac{14}{2}-\frac{3.25}{2}-\frac{1}{2}log [2.22]

pH = 5.21

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

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