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4 years ago

Which of the elements below has the greatest electronegativity? He F Fr Rn

Chemistry

2 answers:

Studentka2010 [4]4 years ago

8 0

Answer: The element having greatest electronegativity is Fluorine.

Explanation:

Electronegativity is defined as the tendency of an element to attract electrons towards itself. More strongly an element attracts electrons, more will be its electronegativity and vice-versa.

Electronegativity of Group 18 elements is usually 0 except Xenon which has an electronegativity value of 2.6. These elements have filled valence shell and hence they do not attract electrons towards itself and hence, has no electronegativity.

In a periodic table, electronegativity decreases down the group and increases from left to right in a period.

Fluorine is present at Period 2, Group 17 of the periodic table.

Francium is present at Period 7, Group 1 of the periodic table.

Hence, fluorine will have the greatest value of electronegativity among the given elements.

Law Incorporation [45]4 years ago

3 0

F.
it's the greatest electron "hogger"
as you get closet to it, the stronger the electro negitivity.
He is halogen : they don't like to gain electrons. they are already stable.

Fr and Rn
are metals as far is I can remember. they would prefer losing electrons.

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Answer: -

A 3.00-l flask is filled with gaseous ammonia, NH₃. the gas pressure measured at 26.0 ∘c is 1.55 atm . assuming ideal gas behavior, 3.23 grams of ammonia are in the flask

Explanation: -

Volume V = 3.00 L

Pressure P = 1.55 atm

Temperature T = 26.0 °C + 273 = 299 K

We know the value of Universal gas constant R = 0.082 L atm K−1

mol−1

We use the ideal gas equation

PV = nRT

Number of moles of Ammonia n = $\frac{PV}{RT}$

= $\frac{1.55 atm x 3.00 L}{0.082 L atm K−1
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= 0.19 mol

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Mass of NH₃ = Molar mass of NH₃ x number of moles of NH₃

= 17 g / mol x 0.19 mol

= 3.23 g

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swat32

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2 years ago

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Hydroxide oh3 can react as a brønsted-lowry base (and remove a proton), or as a lewis base (and attack a carbon atom). what orga

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Select the correct answer from each drop-down menu. a 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24

anzhelika [568]

Taking into account the definition of calorimetry, the mass of water is 35.70 grams.

<h3>What is calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

Q is the heat exchanged by a body of mass m.
c is the specific heat substance c.
ΔT is the temperature variation.

<h3>Mass of water in this case</h3>

In this case, you know:

For granite:

Mass of granite= 126.1 g
Initial temperature of granite= 92.6 °C
Final temperature of granite= 51.9 ºC
Specific heat of granite = 0.795 $\frac{J}{gC}$

For water:

Mass of water = ?
Initial temperature of water= 24.7 ºC
Final temperature of water= 51.9 ºC
Specific heat of water = 4.186 $\frac{J}{gC}$

Replacing in the expression to calculate heat exchanges:

For gold: Qgranite= 0.795 $\frac{J}{gC}$ × 126.1 g× (51.9 °C - 92.6 °C)

For water: Qwater= 4.186 $\frac{J}{gC}$ × mass of water× (51.9 °C - 24.7 °C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qgranite = + Qwater

- 0.795 $\frac{J}{gC}$ × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 $\frac{J}{gC}$ × mass of water× (51.9 °C - 24.7 °C)

Solving:

4,080.15465 J= 4.186 $\frac{J}{gC}$ × mass of water× 27.3 °C

4,080.15465 J= 114.2778 $\frac{J}{g}$ × mass of water