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In a titration, 39.7 mL HNO3 were required to neutralize 24 mL of 0.250M
Ba(OH)₂. Calculate the molarity of the acid.

Answer:

Fe2O3

Explanation:

get the ratio for both Fe and O using relative atomic mass and the percent as the mass

A physical property of a pure substance is anything that can we can observe without changing its identity.

Density:

The density is property of matter which expresses  a relationship of mass to volume.

Melting:

The melting pint is the physical property because we can determine the melting point of a substance without changing its chemical composition.

Boiling:

As the liquid matter is heated further it eventually boils or vaporizes into a gas at the boiling point.

Conductivity:

Conductivity is the physical property  because the identity of the substance does not change.

So we can conclude that a physical property of a pure substance is anything that can we can observe without changing its identity.

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The concentration of the oxonim ion is 0.0099 M while the pH of the solution is 2.

The term Ka means the acid dissociation constant. This speaks of the extent to which the acid is able to become dissociated in water. We know that is an acid is able to dissociate completely in water then the acid is a strong acid. However, if the acid is not able to dissociate complete in solution then the acid is a weak acid.

We can now set up the ICE table as we would show below;

      HNO2(aq) + H2O (l) ⇔ H3O^+(aq)  + NO2^-(aq)

I      0.145                                 0                     0

C       -x                                    +x               +x  

E     0.145 - x                            x                   x

Ka = 7.2x10^−4

Ka = [H3O^+] [NO2^-]/[ HNO2]

7.2x10^−4 = x^2/0.145 - x  

7.2x10^−4(0.145 - x) = x^2

1.044 * 10^-4 - 7.2x10^−4x = x^2

x^2 +  7.2 * 10^-4x - 1.044 * 10^-4 = 0

x=0.0099 M

Then we know that  [H3O^+] = [NO2^-]

Thus;

pH = - log(  [H3O^+])

pH = - log(0.0099 M)

pH = 2

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Answer: \(K_a\) for the acid is \(2.7\times 10^{-4}\)

Explanation:

\(C_9H_7O_4H\rightarrow H^+C_9H_7O_4^-\)

   c             0             0

\(c-c\alpha\)        \(c\alpha\)          \(c\alpha\)  

So dissociation constant will be:

\(K_a=\frac{(c\alpha)^{2}}{c-c\alpha}\)

Give c= 0.313 M and \(pH\) = 2.031

\((\alpha)=0.030\)

\([H^+]=c\times \alpha\)

\([H^+]=0.500\times 0.030=0.015\)

Also \(pH=-log[H^+]\)

\(2.031=-log[H^+]\)

\([H^+]=0.009\)

[ \([H^+]=c\alpha\)  

\(c\alpha=0.009\)

Putting in the values we get:

\(K_a=\frac{(0.009)^2}{(0.313-0.009)}\)

\(K_a=\frac{(0.009)^2}{(0.304)}=2.7\times 10^{-4}\)

\(K_a\) for the acid is \(2.7\times 10^{-4}\)

Answer:

65.72 g

Explanation:

mass = density × volume

= 1.02 g/ml × 62 ml

= 65.72 g

Answer:

1.24 × 10²⁵ molecules of oxygen gas

Explanation:

Step 1: Given data

Moles of oxygen gas: 20.6 moles

Step 2: Calculate the number of molecules present in 20.6 moles of oxygen gas

In order to convert moles to molecules, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.

20.6 mol × 6.02 × 10²³ molecules/1 mol = 1.24 × 10²⁵ molecules

The pH of the solution represent in the diagram, given that the solution contains 1 mole of H⁺ is 2 L is 0.3 (option B)

We'll begin by obtaining the hydrogen ion, H⁺ concentration in the solution. This is shown below:

Concentration = mole / volume

Hydrogen ion, H⁺ concentration = 1 / 2

Hydrogen ion, H⁺ concentration = 0.5 M

Finally, we shall determine the pH of the solution. Details below:

pH = -Log [H⁺]

pH = -Log 0.5

pH = 0.3

Thus, we can conclude that the pH of the solution is 0.3 (option B)

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Answer:

B.  Keq = 6.0 x 10-2.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to remember that any equilibrium constant is computed by dividing the concentration of products by that of reactants:

\(Keq=\frac{[Prod]}{[Reac]}\)

Thus, a reaction that is reactant-favored will have a Keq>1 because the concentration of reactants prevail over that of products at equilibrium, and thus, the correct answer is B.  Keq = 6.0 x 10-2.

Regards!

Step 1

Molarity is defined as:

molarity (M or mol/L) = moles of solute/volume of the solution (L)

-------------

Step 2

Information provided:

Moles of solute (LiCl) = 4.5 moles

Volume of solution = 3.7 L

-------------

Step 3

Procedure:

Molarity = 4.5 moles/3.7 L = 1.216 mol/L

Answer: Molarity = 1.216 mol/L

Answer: There are 5.99 moles present in \(3.612 \times 10^{24}\) atoms of Carbon.

Explanation:

According to the mole concept, 1 mole of every substance contains \(6.022 \times 10^{23}\) atoms.

Therefore, number of moles present in \(3.612 \times 10^{24}\) atoms are as follows.

\(Moles = \frac{3.612 \times 10^{24}}{6.022 \times 10^{23}}\\= 5.99 mol\)

Thus, we can conclude that there are 5.99 moles present in \(3.612 \times 10^{24}\) atoms of Carbon.

To see the total number of atoms of an element we need to multiply stoichiometry of that element to the number that is written on the foot of that element. Thus the balanced equation is

NaNO₂(aq)+AgNO₃(s)→NaNO₃(aq)+AgNO₂(s)

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side

The unbalanced equation is

NaNO₂(aq)+AgNO₃(s)→NaNO₃(aq)+AgNO₂(s)

Sodium atoms on reactant and product side is 1

Silver atoms on reactant and product side is 1

Nitrogen atoms on reactant side and product side is 2

Oxygen atom on reactant side and product side is 5

Thus the balanced reaction is

NaNO₂(aq)+AgNO₃(s)→NaNO₃(aq)+AgNO₂(s)

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Answer:

2H2 + 02 --> 2H20

Explanation:

H2 + 02 --> H2O

H =2x2 = 4                |   H = 2 x 2 = 4

                                 |

O =2                          |   O = 1 x 2 = 2

dm me if u have questions regarding the solution hihi :)

Answer:

d = 1.8 g/mL

Explanation:

Given data:

Mass of bottle = 6.8 g

Volume of liquid = 23.1 mL

Mass of bottle + liquid = 48.8 g

Density of liquid = ?

Solution:

First of all we will calculate the mass of liquid.

Mass of liquid = combined mass - mass of bottle

Mass of liquid = 48.8 g - 6.8 g

Mass of liquid = 42 g

Density of liquid:

d = m/v

d = 42 g/ 23.1 mL

d = 1.8 g/mL

Answer:monosaccharides

Explanation:

Answer:

PhCH2CH2COOH

Explanation:

This is a reaction of PhCH2CH2Br with KCN in the presence of H3O^+. The reaction first leads to the formation of PhCH2CH2CN.

We must recall that part of the properties of nitriles is that they can be converted to carboxylic acids in the presence of H3O^+. This is a common synthetic route for carboxylic acids.

Therefore, when the PhCH2CH2CN is now further reacted with H3O^+, the carboxylic acid PhCH2CH2COOH is formed as the major organic product of the reaction, hence the answer given above.

Option (e) is correct. Alcohol is not a humectant because it binds to water and dehydrates the body.

Humectant is a substance which is used to keep things moist. A humectant attracts and retains the moisture in the air nearby via absorption. Sorbitol is a naturally occurring polyol. It is widely used in the food industry as a humectant. Sorbitol is a good humectants. Glycerol is a humectant which is most often derived naturally from vegetable oils. Humectants work to preserve other skincare ingredients and retain moisture by drawing water from the surface of your skin down into the deeper skin layers. Lanolin oil softens the skin and is a good humectant making it ideal for use in you skin care products. Methyl is an extremely effective humectant for both rinse off and leave on products. It is recommended for use in skin care products including lotions and creams.

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On changing dielectric, charge changes directly. It is directly proportional to dielectric permittivity of free space.

In electromagnetism, a dielectric (or dielectric medium) is an electrical insulator that can be captivated by an applied electric field. At the point when a dielectric material is put in an electric field, electric charges don't course through the material as they do in an electrical conduit, since they have no inexactly bound, or free, electrons that might float through the material, however rather they shift, just somewhat, from their typical balance positions, causing dielectric polarization.

Due to dielectric polarization, positive charges are dislodged toward the field and negative charges change in the course inverse to the field (for instance, assuming that the field is moving lined up with the positive x hub, the negative charges will change in the negative x course). This makes an inside electric field that decreases the general field inside the actual dielectric. Assuming a dielectric is made out of pitifully reinforced particles, those atoms become energized.

We know that Q=CV where Q is charge, C is capacitance and V is the voltage of capacitor.

Since, capacitance is equal to= (∈A₀) /d  where ∈ is permittivity of free space or dielectric value.

If we increase dielectric value, capacitance will increase. When capacitance increase ,charge will also increase.

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Answer:

2160000 seconds

Explanation:

Step 1: Find conversions

1 hr = 60 min

1 min = 60 sec

Step 2: Use Dimensional Analysis

\(600 \hspace{2} hrs(\frac{60 \hspace{2} min}{1 \hspace{2} hr} )(\frac{60 \hspace{2} sec}{1 \hspace{2} min} )\) = 2160000 seconds

The number of grams in 6.02 × 10²³ formula units of aluminium chloride is 101.96g.

The mass of a substance can be calculated from the formula units by dividing the number of formula units by Avogadro's number.

According to this question, there are 6.02 × 10²³ formula units of aluminum oxide. This means that;

no of moles = 6.02 × 10²³ ÷ 6.02 × 10²³

no of moles = 1 mole

molar mass of aluminium oxide = 101.96g/mol

mass of aluminum oxide = 101.96g/mol × 1 mole = 101.96g

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Yes. If you lower the temperature of a test tube of water slowly, the water can remain liquid if it is not disturbed. As soon as the super cold water is disturbed the water will start crystalizing at a nucleation point and will convert to ice very quickly.

Answer:

Why does a beaker disappear in oil?

If you submerge regular glass in vegetable oil, the light is refracted between the oil and the glass surface, allowing you to see the glass through the oil. ... The Pyrex® glass has the same angle of refraction as the vegetable oil, so the light bends at the same angle. As a result, the Pyrex® glass seems invisible.

Explanation:

Answer:

The empirical formula of C6 H12,

Answer:

Physical and chemical methods can be used to monitor the rate of a chemical reaction. Physical methods measure changes in properties like temperature, pressure, or volume. Chemical methods track reactant consumption or product formation using techniques like titration or spectrophotometry. The choice of method depends on the reaction being studied, and scientists use these methods to gain insight into reaction kinetics and optimize conditions for better efficiency and selectivity.

A 6.50-g sample of copper metal at 25.0 °C is heated by the addition of 145 J of energy. The final temperature of the copper is 83.7 °C. The specific heat capacity of copper is 0.38 J/g-K.

The correct answer choice is "83.7"

To solve this problem, we can use the equation:

q = mcΔT

where q is the amount of energy absorbed by the copper, m is the mass of the copper, c is the specific heat capacity of copper, and ΔT is the change in temperature of the copper.

Rearranging this equation to solve for ΔT, we get:

ΔT = q / (mc)

Substituting the given values, we get:

ΔT = 145 J / (6.50 g x 0.38 J/g-K)

ΔT = 58.7 K

Therefore, the final temperature of the copper is:

25.0 °C + 58.7 °C = 83.7 °C

So the correct option is 83.7.

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The heat of vaporization of CH3CN is obtained from the question as 25 KJ/mol.

We can obtain the number of moles from;

PV = nRT

P = 1 atm

V = 1.17 L

n = ?

R = 0.082 atm LK-1mol-1

T = 81.6 °C + 273 = 354.6 K

n = PV/RT

Substituting values;

n =  1 atm × 1.17 L/0.082 atm LK-1mol-1 × 354.6 K

n = 0.04 moles

Using; q = n·ΔHv

q = Heat absorbed

n = number of moles

Hv  = Heat of vaporization

ΔHv = q/n

ΔHv = 1.00 × 10^3/0.04

ΔHv = 25 KJ/mol

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Answer:

\(V_{NO}=2.8L\)

Explanation:

Hello!

In this case, we consider the given reaction to realize there is a 5:4 mole ratio between oxygen and nitrogen monoxide; thus, we infer that, at STP conditions, such mole ratio is eligible as a volume ratio too; therefore, the produced liters of nitrogen monoxide gas is:

\(V_{NO}=3.5LO_2*\frac{4LNO}{5LO_2} \\\\V_{NO}=2.8L\)

Best regards!

Answer:

4.02 kJ

Explanation:

We must convert the answer to kJ 4023.25 J . 1kJ /1000 =4.02kJ