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adelina 88 [10]
3 years ago
11

Need help with this.

Chemistry
2 answers:
alina1380 [7]3 years ago
4 0

Answer: I think it is 153m

Explanation:

prohojiy [21]3 years ago
3 0
The correct answer is 250, I just had this question in class and I got it correct c: !
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Which statement best describes the development of theories that connected microscopic and macroscopic phenomena?
Alina [70]

The statement which best describes the development of theories that connected microscopic and macroscopic phenomena is; <em>q</em><em>It took several hundred years for scientists to develop current theories, and they are still being revised to </em><em>this.</em>

<em>Discussion</em><em>;</em>

Most scientific theories involving microscopic and macroscopic phenomenon have taken several years to be developed; however, this theories are still under revision till date.

Read more:

brainly.com/question/13407374

3 0
3 years ago
If a(n) ___<br> ended question is too challenging, respondents will abandon the survey
Colt1911 [192]

Answer:

Open ended question

Explanation:

Built different :]

3 0
3 years ago
For each reaction, find the value of ΔSo. Report the value with the appropriate sign. (a) 3 NO2(g) + H2O(l) → 2 HNO3(l) + NO(g)
aev [14]

Answer:

ΔS° = -268.13 J/K

Explanation:

Let's consider the following balanced equation.

3 NO₂(g) + H₂O(l) → 2 HNO₃(l) + NO(g)

We can calculate the standard entropy change of a reaction (ΔS°) using the following expression:

ΔS° = ∑np.Sp° - ∑nr.Sr°

where,

ni are the moles of reactants and products

Si are the standard molar entropies of reactants and products

ΔS° = [2 mol × S°(HNO₃(l)) + 1 mol × S°(NO(g))] - [3 mol × S°(NO₂(g)) + 1 mol × S°(H₂O(l))]

ΔS° = [2 mol × 155.6 J/K.mol + 1 mol × 210.76 J/K.mol] - [3 mol × 240.06 J/K.mol + 1 mol × 69.91 J/k.mol]

ΔS° = -268.13 J/K

7 0
3 years ago
A neutral atom of sodium (Na) has an atomic number of 11 and a mass number of 23. How many neutrons would be found in the nucleu
SCORPION-xisa [38]
<h3>Answer:</h3>

12 neutrons

<h3>Explanation:</h3>
  • A neutral atom is an atom that has no charge, which means it has no additional electrons or electrons removed from its energy levels.
  • An atom is made up of sub-atomic particles neutrons and protons found in the nucleus and electrons found in the energy levels.
  • The number of protons in the nucleus of a neutral atom is known as the atomic number.
  • In a neutral atom, the atomic number is equal to the number of electrons as protons are equal to the number of electrons.
  • The sum of protons and neutrons in the nucleus of an atom is known as the mass number of an atom.

Therefore;

Protons = Atomic number

Protons + neutrons = Mass number

Thus;

Neutrons = Mass number - protons or

                = Mass number - atomic number

In this case;

Atomic number = 11

Mass number = 23

Thus;

Neutrons = mass number - atomic number

               = 23 - 11

              = 12 neutrons

7 0
3 years ago
24ethanjones88 unfvbfuhgtbnuthigthtijbtnibttbhiitti
kirill [66]

Answer:

mmm Nice B)

Explanation:

7 0
3 years ago
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