How many formula units of NaCl are
in 116 g NaCl? The molar mass of
NaCl is about 58 g/mol.
116 g

Answer:

[tex]\fbox {(2) 4.9}[/tex]

Explanation:

Applying the Ideal Gas Equation :

[tex]\boxed {PV = nRT}[/tex]

Finding n :

Solving for P :

∴ The pressure inside the flask in bar is 4.9.

Moles of oxygen

Temperature=273+27=300K

Apply ideal gas equation

Answer:

A. Non-metal

B. Six

C. 2

D.NA2O

E.Oxygen

Explanation:

Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen

Volume of hydrogen gas = 35.2L

Temperature of hydrogen gas = 25.0°C + 273 = 298 K

Pressure of hydrogen gas = 101.3 kPa = 1 atm

(Conversion factor 1 atm = 101.325 kPa)

Using the Ideal gas law,

PV = nRT

where P, V, n, R and T are pressure, volume, number of moles, universal gas constant and temperature respectively.

n = PV/RT

The number of moles of hydrogen gas,

n = 35.2 L x 1 atm/ 0.0821 L.atm.mol⁻¹1.K⁻¹ x 298 K

n = 1.438 moles

2HCl + Ca → H₂ + CaCl₂

Based on the given balanced equation, 1 mole of H₂ is produced from two  moles of HCl.

Since H₂ is 1.438 moles, HCl will be (1.438 x 2) moles or 2.876 moles

Given, Molarity of HCl = 2.3 M

Molarity = moles of solute / liter of the solution

Thus the volume of HCl is,

2.3 M = 2.876 moles / liter of the solution

V = 2.876 moles / 2.3 M

V = 1.25 L

Thus the volume of 2.3 M hydrochloric acid required to produce the given amount gas is 1.25 L.

2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

The half reaction of overall reaction in which reactants gain its electrons during the reaction is called Reduction Half Reaction.

The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.

The given reaction is

2I⁻ (aq) + Cl₂ (aq) → 2Cl⁻ (aq) + I₂ (aq)

Reduction Half Reaction: 2Cl + 2e⁻ → 2Cl⁻

Oxidation Half Reaction: 2I⁻ - 2e⁻ → 2I

Here Cl₂ is an oxidizing agent and I⁻ is reducing agent.

Thus from the above conclusion we can say that 2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.

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The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.

Y is the septum

The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.

Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.

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Answer:

387 g/mol

Explanation:

The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:

Molar Mass (g/mol) = mass (g) / moles

You can plug the given values into the ratio to find the molar mass.

Molar Mass = mass / moles

Molar Mass = 0.406 g / 0.00105 mol

Molar Mass = 387 g/mol

Answer:

False

Explanation:

The subscripts of chemicals can't be changed in a chemical reaction, otherwise the products or the reactants would be a completely different molecule. We can't just change O2 to being O3, but we can change O2 into 3/2 O2 (in some cases)

The acid that contains three hydrogen ions are called triprotic acid.

White solid pure anhydrous phosphoric acid melts into a viscous liquid at 42.35 degrees Celsius. Phosphoric acid, which contains three ion hydrogen atoms, acts as a triprotic acid in an aqueous solution. The hydrogen ions disappear one at a time.

H₃PO₄ (aq)  ⇄  H⁺ (aq) + H₂PO₄⁻ (aq)          Kₐ₁ = 7.5 × 10⁻³

H₂PO₄⁻ (aq)  ⇄  H⁺ (aq) + H₂PO₄²⁻ (aq)       Kₐ₂ = 6.2 × 10⁻³

HPO₄²⁻ (aq)  ⇄  H⁺ (aq) + PO₄³⁻ (aq)            Kₐ₃ = 7.5 × 10⁻³

The first dissociation constant of phosphoric acid indicates that it is not an especially potent acid. It is a weaker acid than hydrochloric acid and sulfuric acid, but stronger than acetic acid. The ease with which each subsequent dissociation stage happens decreases. As a result, H₂PO₄⁻  is a relatively weak acid but HPO₄²⁻ is an extremely weak acid.

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The formal charge of the nitrogen atom present at the center in dinitrogen sulfide is +1.

Formal charge:

The formal charge relates the presence of electrons on the atom when it is not present in a molecule and when it present in a molecule.

Lewis structure:

The structural representation of a compound by showing the electrons present around the atom with dots is called the Lewis dot structure.

The three possible Lewis structures of dinitrogen sulfide are shown below.

However, the best Lewis structure among those is first one. The central nitrogen atom is carrying a positive charge while the sulfur atom has a negative charge. The charges on these atoms are most stable thereby making the compound stable.

Therefore, the formal charge on the central nitrogen atom is +1.

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Planck's constant symbolized (h) relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.

The equation, E=hf, is referred to as the Planck relation or the Planck-Einstein relation. The letter h is named after Planck, as Planck's constant.

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The original temperature of the copper is 145.4 °C

Temperature refers to the degree of hotness or coldness of a body. Now we know that the heat lost by the copper is equal to the heat gained by the water. The heat lost is negative while the heat gained is positive.

Hence;

-(mcdT)= mcdT

-(80.0 * 0.20 ( 26.9 - T)) = 100 * 4.12 * (26.9 - 22.3 )

-(430.4 - 16T) = 100 * 4.12 * (26.9 - 22.3 )

-430.4 + 16T = 1895.2

T =  1895.2 + 430.4 /16

T = 145.4 °C

The temperature of the copper is 145.4 °C.

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The percent by volume of propanone in the solution is  6.6 % .

Volume of solute ([tex]C_{3} H_{6} O[/tex]) = 20.0 mL

Volume of solution = 300 mL

To calculate the percent:

% by vol= (vol solute/vol of soln) x 100

             = (20mL C₃H₆O/300mL) x 100

             = 6.6 % propanone .

Therefore, the percent by volume of propanone in the solution is  6.6 %.

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Answer:

Ethanol can be produced by fermentation and concentrated using fractional distillation .

Answer:

there are 18 groups

Explanation:

Answer:

IA....... VIIIA. main groups (A groups)

IB....... VIIIB. sub groups (B groups)

totally they are 18

Answer:

[tex]\huge\boxed{\sf Alkene}[/tex]

Explanation:

The molecule shown is an Alkene, since:

[tex]\rule[225]{225}{2}[/tex]

The new pressure will be 7.65 atm

The problem is solved using the general gas equation:

P1V1/T1 = P2V2/T2

In this case, P1 = 3.4 atm, V1 = 1500 mL, T1 = 25 [tex]^O C[/tex], V2 = 2000 mL, and T2 = 75  [tex]^O C[/tex]

What we are looking for is P2.

Thus, P2 = P1V1T2/T1V2

          = 3.4 x 1500 x 75/25 x 2000 = 382500/50000 = 7.65 atm

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Answer:

12,500 L

Explanation:

Because you are dealing with volume and temperature, you need to Charles' Law to find your missing value. The equation looks like this:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final volume of the gas.

V₁ = 10,000 L                 V₂ = ? L

T₁ = 20 °C                       T₂ = 25 °C

V₁ / T₁ = V₂ / T₂                                             <----- Charles' Law equation

(10,000 L) / (20 °C) = V₂ / (25 °C)                <----- Insert values

500 = V₂ / (25 °C)                                        <----- Divide 20 from 10,000

12,500 = V₂                                                 <----- Multiply both sides by 25

Answer:

B.) A mixture can be separated by physical means.

Explanation:

While it may be difficult, mixtures can be separated back into their original elements/compounds. Compounds cannot be separated because their original elements/compounds bond together to form the new compound. The only way to separate compounds is through chemical (or drastic physical) means.

Answer:

0.10 moles H₂O

Explanation:

The unbalanced equation:

NH₃ (g) + O₂ (g) ----> NO (g) + H₂O (g)

Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen

Products: 1 nitrogen, 2 hydrogen, 2 oxygen

The balanced equation:

4 NH₃ (g) + 5 O₂ (g) ----> 4 NO (g) + 6 H₂O (g)

Reactants: 4 nitrogen, 12 hydrogen, 10 oxygen

Products: 4 nitrogen, 12 hydrogen, 10 oxygen

Now that the reaction is balanced, you can use the coefficients of the desired molecules to construct the mole-to-mole ratio. This ratio should be multiplied by the given value (0.085 moles). It is important to arrange the ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to match the given value.

0.085 moles O₂          6 moles H₂O
-------------------------  x  ------------------------  =  0.10 moles H₂O
                                      5 moles O₂

Answer:

A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.

Explanation:

"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic

Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.

Oxidizing acids reacts violently with combustible such as alcohols, turpentine, charcoal, organic refuse because when it reacts with most metals, it release hydrogen gas in the air.

So we can conclude that Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.

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The answer is Water is produced.

The molarity of the solution is given as follows:

Molarity = 6.42/142/0.135 = 0.33 M

The concentration of the solution is given below:

Concentration = 43.2/58.5/0.29

Concentration = 2.54 mol/dm³

The concentration of the solution is given below:

Concentration = mass/molar mass /volume (L)

Concentration = 24.8/58.5/0.75

Concentration = 0.56 mol/dm³

Mass of NaCl = 0.238 * 58.5 * 0.35

Mass of NaCl =  4.87 g

Mass of AgNO₃ = 4.71 * 170 * 0.145

Mass of AgNO₃ =  116.1 g

Mass of AgNO₃ = 4.71 * 170 * 0.29

Mass of AgNO₃ =  232.2 g

In conclusion, the mass of the substances are derived from the volume and concentration of the solution as well as the molar mass of the substance.

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According to collision theory, the molecules' orientation is the only characteristic that won't affect whether two molecules will bond.

Factors affecting the collision theory:

                  1. collision with

                  2. have enough energy and

                  3. in the right orientation for collisions to succeed.

Therefore, the direction that two molecules are facing will not affect whether they will bond together according to collision theory that is option A is correct.

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Compared to water, the pH of a buffer solution resist changes when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.

A buffer solution, also known as a buffer, is a mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid). When a weak acid or a weak base is applied in modest amounts, buffer solutions withstand the pH shift.

The conjugate base of the buffer system reacts with a small amount of strong acid to change it into the weak acid of the buffer system. The pH then just slightly declines, the weak acid concentration rises, and the conjugate base concentration falls.

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The fraction of the mass in the tube is liquid is mathematically given as

kg =0.99876 kg liquid/kg

Generally, the critical volume is mathematically given as

Vc=0.0560* 1/18

Vc=0.00311m3/g

at state 1, at saturated condition having volume 0.003111 m3/kg

for 0.1mpa

V1=0.00104KJ/kg

Vg=1.6720KJ/kg

Hence, the  quality of the vapor-liquid mixture is

Q=[tex]\frac{0.00311-0.001043}{1.6720 - 0.001043}[/tex]

Q=0.001237kgv/kgm

Mass fraction of liquid present = (1-x)

M=(1-x)

Hence

M=(1-0.001237)

kg =0.99876 kg liquid/kg

In conclusion, a fraction of the mass in the tube is liquid

kg =0.99876 kg liquid/kg

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The reaction is an addition reaction.

Addition reactions are chemical reactions involving 2 or more reactants reacting to produce a single product.

Addition reactions are different from decomposition reactions. In the latter, a single reactant decomposes to give two or more products.

In the illustrated reaction, Cl₂O5 and H₂O react together to form a single product, HCIO3.

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