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3 years ago

Write the full electron configuration for an N2− ion

Chemistry

2 answers:

I am Lyosha [343]3 years ago

5 0

Answer:

[He] 2s2 2p3

Hope it helps

Mice21 [21]3 years ago

3 0

Answer:

The full electron configuration for an N2− ion is 1s^2 2s^2 2p^5

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Question 5 options: The cell potential for an electrochemical cell with a Zn, Zn2 half-cell and an Al, Al3 half-cell is _____ V.

Mashcka [7]

Answer:

The voltage is $E_{cell} = 0.944 \ V$

Explanation:

Generally the half reaction for Zn, Zn2 half-cell is mathematically represented as

$Zn_{(s)}$ ⇔ $Zn^{2+}_{ (aq)} + 2e^-$ (reference study academy)

and the electric potential for this is a constant value

$E_{zn } = -0.7618 \ V$

Generally the half reaction for Al, Al3 half-cell is mathematically represented as

$Al^{3+} _{(aq)} + 3e^-$ ⇔ $Al_{(s)}$

and the electric potential for this is constant value

$E_{Al } = -1.662 \ V$

Therefore the cell potential for an electrochemical cell is mathematically represented as

$E_{cell} = E_{zn } - E_{Al }$

substituting values

$E_{cell} = -0.718 - (-1.662)$

$E_{cell} = 0.944 \ V$

4 0

3 years ago

A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon.

zalisa [80]

Answer:

a) Same

b) Nitrogen

c) Same

d) Nitrogen

Explanation:

The formula for partial pressure of a gas is equal to

$p_B = n_B \frac{RT}{V}$

Here nB is the number of moles .

The number of moles for both the gases are same and hence the partial pressure for the two gases will also be same.

b) The greater average velocity is calculated by using following formula

$v_{RMS} = \sqrt{3RTM}$

Here M is the molar mass.

Molar mass of nitrogen is greater than the molar mass of xenon and hence nitrogen will have higher greater average velocity

c) As we know, the average kinetic energy of gas particles is dependent on the absolute temperature of gas and if all the gases are at same temperature, their kinetic energy will also be same. Since nitrogen and xenon are at same temperature, their kinetic energy will be same

d) Effusivity is depended directly on the thermal conductivity, density and and the specific heat capacity.

All these three parameters are higher in case of nitrogen. Thus, it will effuse first

4 0

3 years ago

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = −310.1 kJ/m

ruslelena [56]

Answer:

3211.12 K

Explanation:

The expression for the standard change in free energy is:

$\Delta G=\Delta H-T\times \Delta S$

Where,

$\Delta G$ is the change in the Gibbs free energy.

T is the absolute temperature. (T in kelvins)

$\Delta H$ is the enthalpy change of the reaction.

$\Delta S$ is the change in entropy.

For reaction to be spontaneous, $\Delta G$

Given, $\Delta H=-310.1\ kJ/mol=-310100\ J/mol$

$\Delta S=-89.00\ J/K.mol$

So,

$\Delta H-T\times \Delta S$

Thus, applying values as:-

$-310100-T\times (-89.00)$

So, T = 3484.27 K

The conversion of T( °C) to T(K) is shown below:

T( °C) = T(K) - 273.15

So,

T = (3484.27 - 273.15) K = 3211.12 K

<u>The temperature below which the reaction is spontaneous is:- 3211.12 K </u>

6 0

4 years ago

What is the [h3o ] for a solution of seawater at 25°c that has a ph of 8.3?

Kipish [7]

PH of solution at 25ºC = 8.3

$[ H_3O^+] = 10 ^{-pH}$

${H_3O^+] = 10 ^{-8.3}$

$[H_3O^+] = 5.011*10^{-9} M$

hope this helps!

6 0

3 years ago

What produces the magnetic force of an electromagnet?

bagirrra123 [75]

Answer:

movement of charged particles through the wire .

Explanation:

When electricity is passed through the wire of electromagnet , moving electrons of the wire produces magnetic field . This magnetic field in increased due to high permeability of soft iron of the electromagnet . It is this magnetic field which creates magnetic force .

6 0

3 years ago