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3 years ago

With what allotrope of oxygen is it isoelectronic in NO2- ?

1 answer:

8 0

Answer: O₃


Explanation:


The term isoelectronic means same number of electrons.


Then you need to count the number of electrons in the given species NO₂⁻.


You have to count the number of electrons of N (nitrogen) atoms, the number of electrons of two O (oxygen) atoms, and the adjust for the negative charge of the ions.

The atomic number of N is 7, meaning that each atom has 7 protons and 7 electrons.

The atomic number of O is 8, meaning that each atom has 8 protons and 8 electrons.


The negative charge of the ion means that it has one extra electron, which is the responsible for the negative charge.


Therefore the total number of electrons of the ion NO₂⁻ is 7 + 2 (8) + 1 = 24.


Note that that 24 = 3 x 8, so 24 is the number of electrons in 3 atoms of oxygen.


The moleucle O₃ is an allotrope of the oxygen. (an allotrope is a a form of an element with different structure and physical properties in the same physical state).


Therefore, the allotrope of oxygen isoelectronic with NO₂⁻ is O₃ (ozone)

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A compound is 2. 00% H by mass, 32. 7% S by mass, and 65. 3% O by mass. What is its empirical formula? The final step is to use

LekaFEV [45]

The empirical formula of this compound is $H_2SO_4$

Given the following data:

Percentage of H = 2.00%

Percentage of S = 32.7%

Percentage of O = 65.3%

Scientific data:

Molar mass of hydrogen (H) = 1.0 g/mol.

Molar mass of sulfur (S) = 32 g/mol.

Molar mass of oxygen (O) = 16 g/mol.

To determine the empirical formula of this compound:

Note: We would assume that the mass of the compound is 100 grams.

Hence, the mass of its constituent elements are:

Mass of hydrogen (H) = 2.00 grams

Mass of sulfur (S) = 32.7 grams

Mass of oxygen (O) = 65.3 grams

Next, we would determine the number of moles of each element by using this formula:

$Number\;of\;moles = \frac{mass}{molar\;mass}$

For hydrogen (H):

$Number\;of\;moles = \frac{2.00}{1}$

Number of moles = 2.0 moles

For sulfur (S):

$Number\;of\;moles = \frac{32.7}{32}$

Number of moles = 1.0 moles

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$Number\;of\;moles = \frac{65.3}{16}$

Number of moles = 4.0 moles

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A photon has an energy of 1.10 x 10 -13 j. What is the photon's wavelength? What type of electromagnetic radiation is it?

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Answer:

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The given photon is either x-ray or gamma ray because the range of x-ray and gamma ray is 1 nm-0.1 pm.

Explanation:

Given data:

Energy of photon = 1.10 × 10⁻¹³ J.

Wavelength of photon = ?

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Formula:

E = h.c / λ

λ = h. c / E

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λ = 19.878 × 10⁻²⁶m / 1.10 × 10⁻¹³ J

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λ = 18.071 × 10⁻¹³ × 10⁹

λ = 18.071 × 10⁻⁴ nm

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