What is the pH of an unknown solution with a molarity of 2.53x10-9

A. 2.53
B. 9.2
C.8.6
D.7

Answer:

i am so sorry. i do not have a answer but i am trying to find questioms i can answer

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The total energy released by this quantity of ²¹⁰Po assuming every atom decays is 2.935×10⁶J.

When there is a lower-energy nuclear configuration to which an atom can transition, the atom radioactively decays. An atom's actual decay event takes place at random and is not brought on by aging or other changes over time.

²¹⁰Po releases energy by ∝-decay.

²¹⁰₈₄Po → ⁴₂He + ²⁰⁶₈₂Pb

Molar amass:

⁴₂He = 4.00151 g/mol

²⁰⁶₈₂Pb= 205.9745 g/mol.

²¹⁰₈₄Po = 209.98286 g/mol

Change of mass

Δm = 1 mol x {(4.00151g/mol +  205.9745 g/mol) - ( 209.98286 g/mol)}

Δm = -0.00685g

Δm = -0.00685g × 1kg/10³g

Δm = -6.85 X10⁻⁶ Kg

Change in energy for 1mol ²¹⁰₈₄Po

E = Δmc²

E = -6.85 X10⁻⁶ Kg × 3.00 × 10⁸m/s²

E = -6.165×10¹¹J   (- ve sign indicates release of energy)

Now, number of mol of ²¹⁰₈₄Po in mg

number of mol of ²¹⁰₈₄Po in mg = 1mg×1g/10³mg×1mol/209.98286g

number of mol of ²¹⁰₈₄Po in mg = 4.76×10⁻⁶mol

Energy released by 1mg ²¹⁰Po is = 6.165×10¹¹J× 4.76×10⁻⁶mol

Energy released by 1mg ²¹⁰Po is = 2.935×10⁶J.

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The glucose that is derived from citric acid cycle molecules must do so via gluconeogenesis. Gluconeogenesis is a metabolic pathway that results in the production of glucose from non-carbohydrate carbon substrates such as amino acids, lactate, and glycerol in the liver and kidneys.

Therefore, Gluconeogenesis is the process of generating glucose from non-carbohydrate carbon substrates in the liver and kidneys. Glucose produced by gluconeogenesis is used by the brain and red blood cells as an energy source. It's an important metabolic pathway that maintains blood glucose levels during fasting periods and is also essential for individuals on a low-carbohydrate or ketogenic diet.

Hence, glucose derived from citric acid cycle molecules must do so via gluconeogenesis.

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The statement that best describes a scatterplot is that it shows quantitative data that relate two variables (option C).

A scatter plot is a type of graph that displays the relationship between two variables.

The scatter plot is portrayed on a cartesian plane where one of the variables is on an axis called X-axis and the other is on another axis called y-axis.

One of the variables is the independent variable while the other variable is the dependent variable.

Therefore, the statement that best describes a scatterplot is that it shows quantitative data that relate two variables.

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The question is incomplete, the complete question is:

Standardization of a Borax solution (Na2B4O7). A student titrates a 20.00 mL sample of an aqueous borax solution with 1.044 M H2SO4. It takes 2.63 mL of acid to reach the equivalence point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?

Answer: The concentration of borax solution is 0.069 M.

Explanation:

To calculate the concentration of borax solution, the formula used is:

\(n_1C_1V_1=n_2C_2V_2\) ....(1)

where,

\(n_1, C_1\text{ and }V_1\) are the n-factor, concentration and volume of sulfuric acid

\(n_2,C_2\text{ and }V_2\) are the n-factor, concentration and volume of borax solution.

We are given:

\(n_1=1\\C_1=1.044M\\V_1=2.63mL\\n_2=2\\C_2=?M\\V_2=20mL\)

Putting values in equation 1, we get:

\(1\times 1.044\times 2.63=2\times C_2\times 20\\\\C_2=\frac{1\times 1.044\times 2.63}{2\times 20}\\\\C_2=0.069M\)

Hence, the concentration of borax solution is 0.069 M.

Answer:

B, The river was eroded the ground since the grasses and roots were removed.

Explanation:  when you have roots in the ground they would soak up the water but because he removed the roots, The water goes where it used to and it eroded the ground.

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

Hope this Helps!~

Explanation:

P_H

and

li_n

hope it helps

Substance A is  liquid at room temperature and pressure, while substance B is  gas under the same conditions.Based on this observation, we can say that intermolecular attractions in substance A are stronger than those in substance B.

Intermolecular attractions  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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Answer:

The student should take the average of the results from all four trials.

Explanation:

Answer:

The student should take the average of the results from all four trials.

Explanation:

The correct option is to take the average of the results from all four trials. This will give the most accurate representation of the boiling point of water, as it takes into account any measurement errors or variations. The value closest to 100°C or the maximum value of the results could be skewed due to a large measurement error or an outlier. Taking the average of the minimum and maximum value of the results is also not ideal as it does not fully consider the results from all four trials.

ALLEN

Answer:

N/A

Explanation:

Is this a true or false answer or.....?

The concentration of the diluted solution be 100 ppm.

Chemistry uses the term PPM, or parts per million, to describe extremely low concentrations of solution. One liter of solution containing milligrams of the chemical is what is meant by this term. Technically speaking, it is a dimensionless quantity that can be used to measure lower concentrations in a solution.There are numerous scientific uses for this conversion.

It refers to how many of the one million parts that make up the entire solution a specific substance or molecule occupies. It is used to describe substance concentrations that are typically dissolved in a solvent. When there are two solutions, and one of them has a known ppm concentration, the ppm concentration can be calculated by:

ppm1 x volume = ppm2 volume

500 ppm x 2 mL = ppm2 x 10 mL

ppm 2 = 500 ppm x 2 mL/ 10 mL

ppm 2 = 100 ppm

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Answer:

Explanation:

Digestion begins in the mouth with the secretion of saliva and its digestive enzymes. In the stomach further release of enzymes break down the food further and this is combined with the churning action of the stomach. The partially digested food enters the duodenum as a thick semi-liquid chyme.

Answer. Speed is the rate of change of position expressed as distance travelled per unit of time

give brainliest if right

Answer:

distance

Explanation:

Answer:

C. The dissolving reaction of A was exothermic and the dissolving of reaction B was endothermic

Explanation:

Here is stuff to help you:

Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a great day!

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Answer:

0.076 atm

Explanation:

Using the combined gas law formula;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

T1 = initial temperature (K)

T2 = final temperature (K)

V1 = initial volume (L)

V2 = final volume (L)

According to the information provided in this question;

P2 = ?

P1 = 0.250 atm

V2 = 496 L

V1 = 300 L

T2 = 200K

T1 = 400K

Using P1V1/T1 = P2V2/T2

0.250 × 300/400 = P2 × 496/200

75/400 = 496 P2/200

0.1875 = 2.48P2

P2 = 0.1875 ÷ 2.48

P2 = 0.076 atm

Answer:

45 500 meters

Explanation:

45 500 meters is your answer]

Glad to help!!

The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration

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The difference in mass between protons and neutrons is generally regarded as B) insignificant.

Protons and neutrons are both subatomic particles found in the nucleus of an atom. They have similar masses, with a proton having a mass of approximately 1.0073 atomic mass units (amu) and a neutron having a mass of about 1.0087 amu. The difference in mass is only around 0.0014 amu, which is considered negligible in most scientific contexts.

This small mass difference is not significant enough to have a substantial impact on the overall properties or behavior of atoms and their nuclei. Both protons and neutrons play crucial roles in maintaining the stability of atomic nuclei, with protons being positively charged and neutrons having no charge. Their combined mass contributes to an atom's atomic mass, which is essential for determining the element's position in the periodic table.

In summary, the mass difference between protons and neutrons is insignificant, as it does not have a notable influence on the characteristics or behavior of atoms. Despite their minor mass difference, both particles are essential components of atomic nuclei and play vital roles in defining the properties of elements. Hence, the correct answer is Option B.

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The given statement "Carbon in the ocean originates from the atmosphere" is true because Carbon is one of the most vital elements on Earth and is involved in various biogeochemical cycles, including the carbon cycle.

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The correct question would be as

Carbon in the ocean originates from the atmosphere. Please select the best answer from the choices provided. True or False

56.98 g of solid KF should be added to 1.00 L of 0.250 M HF to make a buffer with a pH of 3.143.

In order to make a buffer with a pH of 3.143, we need to determine the concentrations of both the weak acid (HF) and its conjugate base (KF).

The pH of a buffer can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the negative log of the acid dissociation constant (pKa = 3.143 for HF), [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

In this case, we have 1.00 L of 0.250 M HF and we want to add KF to make the buffer. The molar mass of KF is 58.1 g/mol, so we can calculate the number of moles of KF needed to make the buffer:

moles KF = (1.00 L) * (0.250 M) / (58.1 g/mol) = 0.0429 moles

Since KF acts as a base in this solution, it will react with HF to form the conjugate base, F-. The concentration of the conjugate base will be equal to the moles of KF added:

[A-] = moles KF / (1.00 L) = 0.0429 moles / (1.00 L) = 0.0429 M

Finally, we can plug in these values into the Henderson-Hasselbalch equation:

pH = 3.143 + log([A-]/[HA]) = 3.143 + log(0.0429 M / 0.250 M) = 3.143

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(A)This reaction does not increase the solubility of iron(II) carbonate.

(B) In this reaction it has no effect on how soluble it is.

(C) In this reaction it doesn't directly affect FeCO₃, it has no effect on how soluble it is.

(D)In this reaction it has no effect on how soluble it is.

(E)This reaction does not increase the solubility of iron(II) carbonate.

Therefore, the reaction that does not increase the solubility of iron(II) carbonate is reaction A) \(Fe^{2+\) (a q) + OH- (a q) « Fe OH+ (a q).

Let's analyze each reaction and its impact on the concentration of \(CO_(3)^{2-}\) ions:

A) \(Fe^{2+}\)(a q) + OH- (a q) « Fe OH+ (a q)

FeOH+ is produced during this reaction, although it has no direct impact on how soluble FeCO₃ is. It has nothing to do specifically with the precipitation or dissolution of FeCO₃.

B) \(CO_(3)^{2-}(a q) + H^+ (a q)\) ⇒ \(HCO^{3-}\) (a q)

In this process, \(CO_3^{2-}\) ions are changed into \(HCO^{3-}\)ions. Since it doesn't directly affect \(FeCO_3\), it has no effect on how soluble it is.

C) \(HCO^{3-} (a q) + H^+ (a q)\) « \(H_2 CO_3\) (a q)

In this process, bicarbonate ions \((HCO^{3-})\) are converted into carbonic acid \((H_2CO_3\). Since it doesn't directly affect FeCO₃, it\(H_2O\) has no effect on how soluble it is.

D) \(H_2CO_3(a q)\)« \(CO_2\) (g) + \(H_2O\) (l)

In this process, carbonic acid \((H_2CO_3\)) is transformed into water () and carbon dioxide (\(CO_2\)) gas. Since it doesn't directly affect FeCO₃, it has no effect on how soluble it is.

E) \(Fe OH^+ (a q) + OH^-\) «\(Fe(OH)_2\) (s)

This reaction involves the precipitation of \(Fe(OH)_2\) (iron(II) hydroxide) from Fe OH+ ions and OH- ions. It consumes OH- ions and reduces their concentration. It does not directly affect the concentration of \(CO_3^{2-}\)ions. Therefore, this reaction does not increase the solubility of iron(II) carbonate.

Based on the analysis, the reaction that does not increase the solubility of iron(II) carbonate is reaction A) \(Fe^{2+ }(a q) + OH^- (a q)\)« \(Fe OH^+\) (a q).

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1. There are approximately 0.974 moles of krypton gas in the sample.

2. The pressure of this gas sample is 25680 mm Hg.

3. The volume of the oxygen gas sample is around 24.3 L at 0.761 atm pressure and 48 °C temperature.

1. To find the number of moles of krypton gas in the sample, we can use the ideal gas law equation:

PV = nRT.

We first need to convert the given temperature from Celsius to Kelvin by adding 273.15, which gives us

T = 11.0 °C + 273.15 = 284.15 K.

Now, we can plug in the values:

(1.08 atm)(22.7 L) = n(0.08206 L atm/mol K)(284.15 K).

Solving for n, we get:

n = (1.08 atm)(22.7 L) / (0.08206 L atm/mol K)(284.15 K)

= 0.974 mol of krypton gas.

2. To find the pressure of the krypton gas sample, we can use the ideal gas law equation:

PV = nRT.

We need to convert the given temperature from Celsius to Kelvin by adding 273.15, which gives us

T = 11.0 °C + 273.15 = 284.15 K.

Now, we can plug in the values:

(P)(22.7 L) = (1.08 mol)(0.08206 L atm/mol K)(284.15 K).

Solving for P, we get:

P = (1.08 mol)(0.08206 L atm/mol K)(284.15 K) / (22.7 L) = 33.8 atm.

To convert this pressure to mm Hg, we can use the conversion factor:

1 atm = 760 mm Hg.

Therefore, the pressure of the krypton gas sample is:

P = 33.8 atm x 760 mm Hg/atm = 25680 mm Hg.

3. To solve this problem, we can use the ideal gas law equation,

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

We can first use the density of the oxygen gas to calculate the number of moles present in the sample.

Once we have the number of moles, we can use the ideal gas law equation to find the volume of the gas.

Converting the temperature from Celsius to Kelvin, we can solve for the volume, which comes out to be around 24.3 L. volume, which comes out to be around 24.3 L.

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