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Eddi Din [679]
3 years ago
11

What is the concentration of H+ ([H+]) of a solution with a pH of 2.5 ?

Chemistry
1 answer:
vitfil [10]3 years ago
4 0

[H3O+] = 10^-pH.

[H3O+] = 10^(-2,5) = 0,0032 moles/dm3

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Draw the lewis structure of the hypochlorite ion clo- . include lone pairs
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total valence electrons = 7 + 6 +1 = 14

(note:- if there is negative charge then it is added  and if there is positive charge then it is subtracted while calculating the valence electrons)

Both Cl and O atoms wants to complete their octet and so for this we put a single bond between them. Single bond means two electrons, so the remaining electrons would be 14 - 2 = 12

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6 0
3 years ago
1. An atom of an elephant has atomic mass of 39 and has number of neutrons as 20 calculate protons number.
r-ruslan [8.4K]

Answer:

See Explanation

Explanation:

1) Let us recall that;

Mass number = number of protons + number of neutrons

Where;

Number of protons = ?

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Mass of protons =39 - 20= 19 protons

2) Atomic number = 13

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Then the mass number =13 +14 =27

The symbol of the element is 27X13

The number of protons= the number of electrons =13

The atomic number is the same as the proton number =13

5 0
2 years ago
All organic molecules have what element in common?
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ALL organic molecules have carbon. 
Hope this helps :)
7 0
2 years ago
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vova2212 [387]

Answer:

I think the answer is

D Wind, Solar, Hydro-Electric

Explanation:

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