Answer:
### What is molecular geometry?

According to the **molecular geometry**, there are two **lone pairs **on central atom of BrF₃.

**Molecular geometry** can be defined as a three -dimensional arrangement of **atoms **which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like **reactivity,polarity **color,magnetism .The molecular geometry can be determined by various **spectroscopic methods **and **diffraction methods **, some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.**Neutron** and **electron diffraction techniques **provide information about the distance between nuclei and electron density.

Learn more about **molecular geometry**,here:

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Answer:

**Answer:**

BrF3 has 2 lone pairs (4 unshared electrons)

**Explanation:**

Zeros laced at the end of the significant number are...

Which is the best description of a molecule?

A chemist fills a reaction vessel with 0.750 M lead (II) (Pb2+) aqueous solution, 0.232 M bromide (Br) aqueous solution, and 0.956 g lead (II) bromide (PbBr2 solid at a temperature of 25.0°C. Under these conditions, calculate the reaction free energy AG for the following chemical reaction: Pb2+ (aq) + 2Br (aq) = PbBr2 (s) Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kilojoule.

Answer the in under 30 minutes and I will give brainliestAfter which event in Indonesia did one of the worst tsunamis form?a hurricanea volcanic eruptiona landslidean earthquake

A 25.0mL solution acetic acid (CH3CO2H) is titrated with 0.20M NaOH and reaches the endpoint after the addition of 16.3mL of NaOH. What is the concentration of acetic acid in solution

Which is the best description of a molecule?

A chemist fills a reaction vessel with 0.750 M lead (II) (Pb2+) aqueous solution, 0.232 M bromide (Br) aqueous solution, and 0.956 g lead (II) bromide (PbBr2 solid at a temperature of 25.0°C. Under these conditions, calculate the reaction free energy AG for the following chemical reaction: Pb2+ (aq) + 2Br (aq) = PbBr2 (s) Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kilojoule.

Answer the in under 30 minutes and I will give brainliestAfter which event in Indonesia did one of the worst tsunamis form?a hurricanea volcanic eruptiona landslidean earthquake

A 25.0mL solution acetic acid (CH3CO2H) is titrated with 0.20M NaOH and reaches the endpoint after the addition of 16.3mL of NaOH. What is the concentration of acetic acid in solution

distance decreases the force between objects. TRUE or FLASE

**Explanation:**

TRUE

the answer is true. Trust me. Im an expert at this.

the specific heat of the resulting Nacl solutions is 4.06j/gc

calculate the heat of neutralisation of hcl and naoh in kj/mol nacl products

**Answer:**

62.12kJ/mol

**Explanation:**

The neutralization reaction of HCl and NaOH is:

HCl + NaOH → NaCl + H₂O + HEAT

You can find the released heat of the reaction and heat of neutralization (Released heat per mole of reaction) using the formula:

Q = C×m×ΔT

*Where Q is heat, C specific heat of the solution (4.06J/gºC), m its mass and ΔT change in temperature (27.5ºC-20.0ºC = 7.5ºC).*

The mass of the solution can be finded with the volume of the solution (50.0mL of HCl solution + 50.0mL of NaOH solution = 100.0mL) and its density (1.02g/mL), thus:

100.0mL × (1.02g / mL) = **102g of solution.**

Replacing, heat produced in the reaction was:

Q = C×m×ΔT

Q = 4.06J/gºC×102g×7.5ºC

Q = 3106J =** 3.106kJ of heat are released**.

There are 50.0mL ×1M = 50.0mmoles =** 0.0500 moles of HCl and NaOH **that are reacting releasing 3.106kJ of heat. That means heat of neutralization is:

3.106kJ / 0.0500mol of reaction =

The **mass **of **hydrogen gas **obtained is **0.068 g **of hydrogen gas.

The **equation **of the reaction is;

Ca(s) +2H2O(l) →Ca(OH)2(aq) + H2(g)

We have to obtain the number of moles of hydrogen gas produced using the information in the question.

P = 988mmHg - 17.54 mmHg =** 1.28 atm**

V = 641 mL or 0.641 L

T = 20 + 273 = 293 K

n = ?

R = 0.082 atmLK-1mol-1

From;

PV = nRT

n = PV/RT

n = 1.28 atm × 0.641 L/ 0.082 atmLK-1mol-1 × 293 K

n = 0.82/24.026

n =** 0.034 moles**

**Mass **of hydrogen = 0.034 moles × 2 g/mol =** 0.068 g** of hydrogen gas

Learn more: brainly.com/question/1445383

**Answer:**

There is 0.0677 grams of H2 gas obtained

**Explanation:**

Step 1: Data given

The total pressure (988 mmHg) is the sum of the pressure of the collected hydrogen + the vapor pressure of water (17.54 mmHg).

ptotal = p(H2)+ p(H2O)

p(H2) = ptotal - pH2O = 988 mmHg - 17.54 mmHg = 970.46 mmHg

Step 2: Calculate moles of H2 gas

Use the ideal gas law to calculate the moles of H2 gas

PV = nRT

n = PV / RT

⇒ with p = pressure of H2 in atm = 970.46 mmHg * (1 atm /760 mmHg) = 1.277 atm

⇒ V = volume of H2 in L = 641 mL x (1 L / 1000 mL) = 0.641 L

⇒ n = the number of moles of H2 = TO BE DETERMINED

⇒ R = the gas constant = 0.08206 L*atm/K*mol

⇒ T = the temperature = 20.0 °C = 293.15 Kelvin

n = (1.277)(0.641) / (0.08206)(298.15) = 0.0335 moles H2

Step 3: Calculate mass of H2

Mass of H2 = moles H2 ¨molar H2

0.0335 moles H2 * 2.02 g/mol H2 = 0.0677g H2

There is 0.0677 grams of H2 gas obtained

**Answer:**

0,12 μmol/L of MgF₂

**Explanation:**

Preparation of solutions is a common work in chemist's life.

In this porblem says that you measure 0,00598 μmol of MgF₂ in 50,0 mL of water and you must calculate concentration in μmol/L

You have** 0,00598 μmo**l but not Liters.

To obtain liters you sholud convert mL to L, knowing 1000mL are 1 L, thus:

50,0 mL (1L/1000mL) = **0,05 L** of water.

Thus, concentration in μmol/L is:

0,00598 μmol / 0,05 L = **0,12 μmol/L **-The problem request answer with two significant digits-

I hope it helps!

B. 0.288 g

C. 0.392 g

D. 0.450 g

E. 0.341 g

**Answer: The correct option is E.**

**Explanation: **The reaction between aspirin (also known as acetylsalicylic acid) and sodium hydroxide is known as **acid-base titration reaction.**

**By applying Unitary method, we get:**

15.50mL of NaOH dissolves = 0.325 g of aspirin

So, 16.25 mL of NaOH will dissolve = = 0.341 g

**Hence, the correct option is E.**

The **value **of the van't Hoff **factor **for the **given **solute is 2.7

**Option **(A) 2.7 is correct.

The Van't Hoff **factor **is a measure of a solute's effect on **colligative **qualities such **boiling **point elevation, osmotic **pressure**, and relative vapor **pressure **reduction.

**Given**,

**Molar **mass is 132.15 g/mol

Boiling **point **elevation is 102.5 °C

**kb **for water is 0.512°c/m

Molarity of **solution **is 1.83 m

The **value **of van't Hoff factor is: 2.66 or 2.7 (approx)

Now, from the **solution **of colligative properties to **calculate **elevation in **boiling **point.

where Δ = elevation of **boiling **point (102.5)

**Thus**, The value is 2.7 **option **(A) is correct.

**Learn **more about van't **Hoff **factor, here:

We need to know the value of van't hoff factor.

**The van't hoff factor is: 2.66 or 2.7 (approximately)**

(NH₄)₂SO₄ is an ionic compound, so it dissociates in solution and produces 3 ionic species. Therefore van't hoff factor is more than one.

From the equation: Δ=i .m, where Δ= elevation of boiling point=102.5 - 100=2.5°C.

m=molality of solute=1.83 m (Given)

= Ebullioscopic constant or Boiling point elevation constant= 0.512°C/m (Given)

i= Van't Hoff factor

So, 2.5= i X 0.512 X 1.83

i=

i=2.66= 2.7 (approx.)