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3 years ago

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

1 answer:

8 0

<span>Answer: O₃
</span><span />

<span>Explanation:
</span>
<span /><span /><span>
The term isoelectronic means same number of electrons.
</span><span />

<span>Then you need to count the number of electrons in the given species NO₂⁻.
</span><span />

<span>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.

</span><span>The atomic number of N is 7, meaning that each atom has 7 protons and 7 electrons.</span>
<span /><span>
The atomic number of O is 8, meaning that each atom has 8 protons and 8 electrons.
</span><span />

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

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

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

<span>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).
</span><span />

<span>Therefore, the allotrope of oxygen isoelectronic with NO₂⁻ is O₃ (ozone)</span>

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8.1 moles of HCl is put into a beaker with enough water to make a total of 189.98 milliliters of

Kay [80]

Answer:

42.64 M

Explanation:

Step 1: Given data

Moles of HCl (solute): 8.1 mol

Volume of the solution: 189.98 mL

Step 2: Convert the volume of the solution to liters

We will use the relationship 1 L = 1,000 mL.

$189.98 mL \times \frac{1L}{1,000mL} = 0.18998L$

Step 3: Calculate the molarity of the solution

The molarity is equal to the moles of solute divided by the liters of solution.

$M= \frac{8.1mol}{0.18998L} = 42.64 M$

8 0

3 years ago

How can water change? I or change into a If 1-Heat causes water toi 2-Water that goes into the alr is called tral air makrs wate

Fofino [41]

1 - evaporate

2 - steam / water vapor

3 - condense

4 - ice

5- ocean/bodies of water

6 - water cycle

4 0

2 years ago

what volume of ethylene gas at 293K and 102kPa must be compressed to yield 295m3 of ethylene gas at 808kPa and 585K

luda_lava [24]

<h3>Answer:</h3>

1170.43 m³

<h3>Explanation:</h3>

<u>We are given;</u>

Initial pressure, P1 as 808 kPa
Initial temperature, T1 as 585 K
Initial volume, V1 as 295 m³
New pressure, P2 as 102 kPa
New temperature, T2 as 293 K

We are required to find the new volume;

We are going to use the combined gas law
According to the gas law; $\frac{P1V1}{T1}=\frac{P2V2}{T2}$
Thus, rearranging the formula;

$V2=\frac{P1V1T2}{P2T1}$

$V2=\frac{(808 kPa)(295)(293K)}{(102 kPa)(585K)}$

$V2=1170.43$

Therefore, the volume is 1170.43 m³

6 0

3 years ago

In a galvanic cell, electrons are transferred from one half cell to the other as the redox reaction progresses. what happens in

Sidana [21]

The half cell in which the electrode gains electrons is where reduction occurs, and the half cell in which the electrode loses electrons is where oxidation occurs.

<h3><u>What is a Galvanic cell ?</u></h3>

Voltaic or galvanic cells are electrochemical devices that use spontaneous oxidation-reduction events to generate electricity. In order to balance the overall equation and highlight the actual chemical changes, it is frequently advantageous to divide the oxidation-reduction reactions into half-reactions while constructing the equations.

Two half-cells make up most electrochemical cells. The half-cells allow electricity to pass via an external wire by separating the oxidation half-reaction from the reduction half-reaction.

<h3><u>Oxidation:</u></h3>

The anode is located in one half-cell, which is often shown on the left side of a figure. On the anode, oxidation takes place. In the opposite half-cell, the anode and cathode are linked.

<h3><u>Reduction:</u></h3>

The second half-cell, cathode, which is frequently displayed on a figure's right side. The cathode is where reduction happens. The circuit is completed and current can flow by adding a salt bridge.

To know more about processes in Galvanic cell, refer to:

brainly.com/question/13031093

#SPJ4

7 0

1 year ago

Vapor obtained by evaporating 0.495 grams of an unknown liquid is collected in a 127 mL flask. At 371 K, the pressure of the vap

lidiya [134]

Answer:

The molar mass in g/mol is 121.4 g/m

Explanation:

Let's apply the Ideal Gases Law to solve this:

P . V = n . R. T

V = 125 mL → 0.125L

P = 754 Torr

760 Torr ___ 1 atm

754 Torr ____ (754 / 760) = 0.992 atm

Moles = Mass / Molar mass

0.992 atm . 0.125L = (0.495 g / MM) . 0.082 . 371K

(0.992 atm . 0.125L) / (0.082 . 371K) = (0.495 g / MM)

4.07x10⁻³ mol = 0.495 g / MM

MM = 0.495 g / 4.07x10⁻³ mol → 121.4 g/m

3 0

3 years ago