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3 years ago

How many bonding domains around the central atom and nonbonding domains around the central atom are their in PF4Cl?

Chemistry

1 answer:

Greeley [361]3 years ago

7 0

Answer:

NH2- has two pairs of bonding and two pairs of non-bonding electrons participated in the formation of a molecule. The central nitrogen atom has two pairs of non-bonding electrons cause repulsion on both bonding pairs which pushes the bonds closer to each other. So, NH2- has a bent (angular) molecular geometry.

Explanation:

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How many grams of sodium fluoride should be added to 300. mL of 0.0310 M of hydrofluoric acid to produce a buffer solution with

Kisachek [45]

Answer : The mass of sodium fluoride added should be 0.105 grams.

Explanation : Given,

The dissociation constant for HF = $K_a=6.8\times 10^{-4}$

Concentration of HF (weak acid)= 0.0310 M

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (6.8\times 10^{-4})$

$pK_a=4-\log (6.8)$

$pK_a=3.17$

Now we have to calculate the concentration of NaF.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[NaF]}{[HF]}$

Now put all the given values in this expression, we get:

$2.60=3.17+\log (\frac{[NaF]}{0.0310})$

$[NaF]=0.00834M$

Now we have to calculate the moles of NaF.

$\text{Moles of NaF}=\text{Concentration of NaF}\times \text{Volume of solution}=0.00834M\times 0.300L=0.0025mole$

Now we have to calculate the mass of NaF.

$\text{Mass of }NaF=\text{Moles of }NaF\times \text{Molar mass of }NaF=0.0025mole\times 42g/mole=0.105g$

Therefore, the mass of sodium fluoride added should be 0.105 grams.

4 0

4 years ago

Please help!!! (im really bad at chemistry)

Lubov Fominskaja [6]

Answer:

1000ml/1L

Explanation:

8 0

3 years ago

Angela is analyzing the fracture pattern of a window. She notes that the cracks stop when they intersect. Knowing this, what can

diamong [38]

Answer:

b.what type of object broke the glass

Explanation:

The point of intersection of all the fracture patterns of the window speaks to the shape, type and dimension of the object that broke the glass.

7 0

4 years ago

What are the three main parts to an electrons “address” used in the current atomic theory that describe an electrons location?

erastova [34]

Answer:

Hope this helps

Explanation:

These are called quantum numbers: there are 4, but the first three are mainly used, only in orbital notation will you use all four.

The first is the electron's energy level or "shell", used as n. (Principle QN)

The second relates to the shape of the orbital and is used as l, when n and l are put together it defines the sublevel or subshell. (Angular Momentum QN)

The third one relates to the orientation of the electrons in that sublevel used as m(sub)l. (Magnetic QN)

The fourth one relates to the spin states of the electron, since they spin opposite directions, used as m(sub)s. (Electron Spin QN)

5 0

3 years ago

2. You have a rock with a<br> volume of 15cm3 and a<br> mass of 45 g. What is its<br> density?

babymother [125]

Answer:

3 g/cm³

Explanation:

Density= Mass divided by Volume

45÷15= 3

3 0

3 years ago