The energy is produced by a reversible chemical reaction involving the transfer of electrons between the two electrodes of the battery.
What is reversible chemical reaction ?A reversible chemical reaction is one in which the products of the reaction can react with each other to form the reactants again. This type of reaction is often represented by an equation that has both the forward and reverse reactions written out. Examples of reversible reactions include the dissociation of salts, the Haber process, and the reaction between hydrogen and oxygen to form water.
This reaction produces an electric current that flows through the circuit connected to the battery. The chemical reaction is reversible, meaning that when energy is applied, the chemical reaction occurs and the energy is stored. When the energy is released, the chemical reaction reverses and the energy is released back out of the battery.
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Explain the trend in the ionic radius of positive and negative ions down groups.
Explain why it trends in this way
what is the relationship between the amount of salt dissolved and the temperature of the water in this experiment?
Amount of salt dissolved directly depends on the temperature of water.
High temperature means higher average velocity of water molecules, thus higher kinematic energies to break the bonds of salts (dissolving salts). Another reason is the higher chance for hotter water molecules to interact with salts, and it is another reason that salts dissolve quicker in hot water.
In short, the reasons are: higher velocities, higher energies and more frequent interactions. Solubility increase with temperatures. This is because hot temperatures make atoms move quicker and the quicker they move, the easier they come apart!
When you hit the maximum amount that will dissolve, you say the mixture is a saturated solution at room temperature.
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Magnesium and nitrogen react in a combination reaction to produce magnesium nitride:
3 Mg + N2→ Mg3N2
In a particular experiment, a 10.1-g sample of N2 reacts completely. The mass of Mg consumed is ________ g.
Magnesium and nitrogen react in a combination reaction to produce magnesium nitride:
3 Mg + N2→ Mg3N2
In a particular experiment, a 10.1-g sample of N2 reacts completely. The mass of Mg consumed is ________ g.
0.92
26.3
8.76
13.9
35.1
The term mole concept is used here to determine the mass of magnesium. The mass of magnesium is 26.3 g. Thus the correct option is B .
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
The balanced equation when Magnesium and nitrogen react in a combination reaction to produce magnesium nitride is:
3 Mg + N₂→ Mg₃N₂
The mass of magnesium is obtained as follows:
10.1 g N₂ × 1 mol N₂ / 28.02 g N₂ × 3 mol Mg / 1 mol N₂ × 24.31 g Mg / 1 mol Mg = 26.28 ≈ 26.3
Thus the correct option is B - 26.3 g.
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nectaryl is a compound with a peachy, apricot-like odor. it is composed of 10.98% hydrogen. how many grams of hydrogen are in a 475-g sample of nectaryl?
Nectaryl is a substance that smells peachy and apricot-like. Hydrogen makes up 10.98% of it. A sample of nectaryl weighing 475 g contains 52.155 g of hydrogen.
Therefore, 10.98% hydrogen is present in nectaryl.
This predicts a hydrogen content of 10.98 g per 100 g of nectaryl.
As a result, the grams of hydrogen in a sample of 475 g of nectaryl is equal to (475 x 10.98)/100=52.155.
The most fundamental member of the chemical element family is hydrogen (H), a colorless, odorless, tasteless, combustible gaseous material. The hydrogen atom has a nucleus made up of a proton with a single unit of positive electrical charge and an electron with a single unit of negative electrical charge. In normal circumstances, hydrogen gas is a loose collection of hydrogen molecules, each of which is made up of two atoms, or a diatomic molecule, H2. In fact, the name hydrogen is derived from Greek words that mean "creator of water." The oldest known significant chemical feature of hydrogen is that it reacts with oxygen to generate water and H2O.
Despite being three times as abundant as helium, hydrogen is the most prevalent element in the universe.
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Which of the following is a correctly written thermochemical equation?
Answer: option A
Explanation:
Answer:
A. a balanced chemical equation that includes the enthalpy change and phase of each reactant and product
Explanation:
took the test.
Give the term for the amount of solute in moles per mass (kg) of solvent.
a) molality
b) molarity
c) mole fraction
d) mole percent
Answer: Molality
Explanation: Molality measures the number of moles in a solute (per 1kg) in a solvent.
what is the pka for an acid if the kb of its conjugate base is 2.3 x 10-4? a. 40.2 b. 25.9 c. 10.4 a. 4.3
The pKa for an acid if the [tex]\mathrm{ K_b}[/tex] of its conjugate base is [tex]2.3 \times 10^{-4 }[/tex] is 10.4.
What is acid?Acid is any chemical substance that has a pH level below 7.0. It is a corrosive substance that can react with other substances and break them down to form new substances. Acids are found naturally in many everyday items such as citrus fruits, vinegar, and yogurt. They can also be created in a lab by combining certain elements in a reaction. Acids have many uses in industries such as metalworking, food processing, and pharmaceuticals. They can also be used in household cleaning products to remove dirt, grease, and other stains. Acids are powerful and should be handled with caution as they can cause burns and other injuries.
At 25° C
[tex]\mathrm{ K_aK_b = 10^{-14 } }[/tex]
[tex]$ \Rightarrow \mathrm{ K_a = \frac{10^{-14}}{2.3 \times 10^{-4 }} }[/tex]
[tex]$ \Rightarrow \mathrm{ K_a = 0.4347 \times 10^{-10 }} }[/tex]
Now,
[tex]\mathrm{ pKa = -\log Ka = 10.4373 }[/tex]
Thus, Option C is correct, The pKa for an acid if the [tex]\mathrm{ K_b}[/tex] of its conjugate base is [tex]2.3 \times 10^{-4 }[/tex] is 10.4.
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carbon-14 is a radioactive isotope with a half-life of 5,730 years. a squirrel bone found in southwestern colorado contains 14 of the carbon-14 of a living squirrel. approximately how old is the squirrel bone?
To determine the age of the squirrel bone based on its carbon-14 content, we can use the half-life of carbon-14. The half-life of carbon-14 is 5,730 years. The age of the squirrel bone is half of the half-life, or 5,730 years / 2 = 2,865 years.
If a squirrel bone contains 14 of the carbon-14 of a living squirrel, it means that half of the original carbon-14 has decayed. This means that the age of the squirrel bone is half of the half-life, or 5,730 years / 2 = 2,865 years.
It is important to note that this method of dating only provides an estimate of the age of the bone, and that the actual age may be slightly different due to various factors such as differences in the rate of decay for different isotopes, and variations in the initial carbon-14 content of the bone. Additionally, this method is only applicable to organic materials that were once living, and cannot be used to date inorganic materials or materials that have not been in contact with the atmosphere.
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strontium-90 has a half-life of 29 years. given that you begin with a 12 mg sample, determine a model that represents the amount of the sample still remaining after 34 years.
There will be 5.3241 mg of the sample still remaining after 34 years.
What does an element's half-life mean?A radioactive isotope's half-life is the amount of time it takes for one half of it to decay. The half-life of a particular radioactive isotope is independent of its surroundings or initial concentration.
The half-life is the amount of time required for a quantity (of substance) to reduce to half of its initial value.
Now, the value of N( t ) is given by the formula ,
N( t ) = N₀ ( 1/2 )^ t/ t½
Where,
The value of t½ = 29 years
The initial amount of strontium-90 (N₀) = 12 mg
The number of days (t) = 34 years
The amount of strontium-90 left after 34 years = N( t )
Substituting the values in the equation , we get
N( t ) = 12 mg( 1/2 )^34/29
N( t ) = 12 mg ( 1/2 )¹ ¹⁷²⁴
N( t ) = 12 mg x 0.4436
N( t ) = 5.3241 mg
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Pb(SO4)2 + 4LiNO3 —> Pb(NO3)4 + 2LiSO4
Equation is balanced
How many molecules of lithium nitrate will be needed to make 2.7
moles of lithium sulfate, assuming that you have an adequate amount
of lead (IV) sulfate to do the reaction?
The amount of many molecules of lithium nitrate that will be needed to make 2.7 moles of lithium sulfate, assuming that you have an adequate amount of lead (IV) sulfate to do the reaction is: 2 moles of lithium nitrate.
How to find the amount of many molecules of lithium nitrate?To find the number of moles of lithium nitrate required, we first need to determine the stoichiometric ratio between lithium nitrate and lithium sulfate in the balanced equation.
From the equation:
Pb(SO4)2 + 4LiNO3 -> Pb(NO3)4 + 2LiSO4
We can see that for every 2 moles of lithium sulfate produced, 4 moles of lithium nitrate are consumed. Therefore, to produce 2.7 moles of lithium sulfate, we need:
4 moles LiNO3 / 2 moles LiSO4 = 2 moles LiNO3
Therefore , 2.7 moles of lithium sulfate would require 2 moles of lithium nitrate.
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Does a centrifuge load always contains an even number of tubes?
Yes, the centrifuge load always contains the an even number of the tubes.
The centrifuge load always contains the an even number of tubes. To prevent the unnecessary wear on the shaft and the bearings, it always load the centrifuge with the an even number of the tubes. If you have the only one sample to the centrifuge, fill the second test tube with the water to the same level as the sample tube have, and the place it in the port of the opposite of the sample tube.
Thus, it is necessary to load always contains the an even number of the tubes.
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Hamdan and Kareem are carrying out an investigation into the reactivity of different
metals with dilute acids. They place a small piece of each metal into a test tube of acid
and observe the reaction.
a) How can they tell that a reaction has taken place?
………………………………………………………………………………
b) How can they tell which metal is more reactive?
………………………………………………………………………………
The answers include the following:
We can tell that a reaction has taken place by observing the acid getting smaller and smaller as it gets used up in the chemical reaction and the presence bubbles of gas which can be seen.The metals that lose electrons easily (highly reactive) cause a fast reaction.What is a Chemical reaction?This is referred to as a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
The presence bubbles of gas which can be seen is what tells us that a reaction has taken place.
Metal + acid → salt + hydrogen
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what does dried mineral water form?
Answer: "Dried mineral water" is a bit of a confusing term, because water is a liquid and cannot really be dried in the traditional sense. However, minerals that are dissolved in water can be left behind when the water evaporates or is removed in some way.
If we assume that you are referring to mineral-rich water that has been evaporated or otherwise had the water removed, then the minerals that were dissolved in the water could form a solid residue or deposit. The exact composition of this residue would depend on the specific minerals present in the water.
For example, if the mineral water contained a high concentration of calcium and magnesium, then the residue could potentially be calcium and magnesium carbonate, which is the same mineral that makes up limestone. If the water contained a high concentration of sodium and chloride, then the residue could be salt.
In general, when water containing minerals evaporates or is removed, the minerals can precipitate out of solution and form a solid deposit. The exact composition of this deposit will depend on the specific minerals present in the water.
A 3.0 L container holds a sample of hydrogen gas at 300 K.
The temperature decreases to 200 K and the pressure remains constant.
What will the volume be?
A)0.1 L
B)0.5 L
C)1.0 L
D)2.0 L
The volume of the hydrogen gas will increase as the temperature decreases to 200 K, so the answer is likely to be greater than 3.0 L.
The volume of the hydrogen gas in the container can be found using the Ideal Gas Law, PV = nRT.
At 300 K, the pressure (P) and number of moles of gas (n) are constant, so the volume (V) and temperature (T) are related by the equation:
V1/T1 = V2/T2
Where V1 is the original volume, T1 is the original temperature, V2 is the new volume, and T2 is the new temperature.
Solving for V2, we get:
V2 = V1 * T2/T1 = 3.0 L * 200 K / 300 K = 2.0 L.
So the volume of the hydrogen gas at 200 K will be 2.0 L.
A 3.0 L container holds a sample of hydrogen gas at 300 K.
The temperature decreases to 200 K and the pressure remains constant.
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Which of the following mathematical expressions correctly states the relationship among percentage yield, actual yield, and theoretical yield?A. Actual yield=(percentage yield)/(theoretical yield) x 100
B. Percentage yield=(actual yield)/(theoretical yield) x 100
C. Percentage yield=(measured yield)/(theoretical yield) x 100
D. Both B. and C.
The mathematical expressions correctly states that dividing the actual yield by the theoretical yield and multiplying by 100 indicates percent yield.
We know that the percent yield is the percent ratio of actual yield to the theoretical yield ( since the actual yield is commonly less than the theoretical yield.), then multiply with 100.
Hence, the true statement about percent yield is "Dividing the actual yield by the theoretical yield and multiplying by 100 indicates percent yield."
∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.
∴ actual yield = [(percent yield of the reaction) x (theoretical yield)]/100.
So the right choice is: (Percent yield × theoretical yield) ÷ 100.
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Based on the graphs, describe the patterns of water used in the world for each continent and type of use. Compare and contrast water the patterns of water use in our homes, agriculture and industry around the world. Which category consumes most water? Use evidence from graphs or charts to support your answer.
The charts show that the greatest water usage would be for agriculture.
Why does agriculture have the greatest water usage?Agriculture is the largest user of water because crops and livestock need water to grow and produce food. Irrigation is a common method of supplying water to crops, and large amounts of water are also used in livestock production to provide drinking water and to clean facilities. In addition, water is also used in food processing, transportation, and storage.
Moreover, agriculture is a significant contributor to global water demand, as the population continues to grow and demand for food increases.
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What is the mass of :
a) 6 X 10²³ atoms of He
b) 6 X 10²³ atoms of Na
c) 6 X 10²³ molecules of nitrogen
d) 6 X 10²⁴ atoms of Cl
e) 1.2 X 10²⁴ atoms of B
f) 1.8 X 10²⁴ atoms of Mg
How many atoms are there in:
a) 7 g of Li
b) 28 g of Si
c) 62 g of S
d) 12 g of Mg
e) 10 g of Ca
f) 200 g of Ne
Helium is the sole element that cannot be solidified by adequate cooling at atmospheric pressure. Therefore, 4g is the mass of helium.
What is helium?Helium (He) is a chemical element and inert gas in Periodic Group 18 (noble gases). Helium, the second lightest chemical (only hydrogen is lighter), is a colorless, odorless, and colorless gas that solidifies at 268.9 °C (452 °F). Helium has lower boiling as well as freezing points than any other known material.
Helium is the sole element that cannot be solidified by adequate cooling at atmospheric pressure; it must be consolidated at a stress of 25 atmospheres at a temperature of one K (272 °C or 458 °F).
mole = given number of atoms/ 6.022×10²³
= 6 X 10²³ /6.022×10²³
= 1 mole
mass = mole× molar mass
= 1×4
= 4g
Therefore, 4g is the mass of helium.
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which of these functional groups behaves as an acid?
The functional group that behaves as an acid is carboxylic acid.
What is a functional group?Functional groups are atoms or groups of atoms that are the active center of a compound, thus determining the physical and chemical properties of the compound.
The functional groups present in amino acids are carboxyl and amine groups. Amino acids are carboxylic acid derivatives that contain an amine group and behave as an acid in a functional group. Each amino acid molecule contains at least two functional groups, namely a carboxyl group (-COOH) and an amine group (-NH2). Based on the structure of these compounds, there are 3 functional groups, namely esters, ketones, and alkenes.
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What happens to gas solubility of oxygen in the blood of a person who is placed in a hyperbaric chamber?
The solubility of oxygen in the blood of a person who is placed in a hyperbaric chamber increases.
This is because the pressure inside the hyperbaric chamber is increased, which results in an increased partial pressure of oxygen. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas, so as the pressure of oxygen increases, the solubility of oxygen in the blood increases.
As a result, more oxygen can dissolve in the blood, providing more oxygen to the tissues and organs of the body. This increased oxygen supply can help to improve oxygenation in tissues that may be deprived of oxygen, such as in cases of decompression sickness, carbon monoxide poisoning, and some wounds.
It is important to note that while the increased solubility of oxygen in the blood can provide benefits in certain cases, it can also lead to toxicity if the pressure is increased too much. Therefore, it is important to carefully monitor the pressure inside the hyperbaric chamber and adjust it as necessary to avoid any harmful effects.
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Choose the best measuring cup to take each measurement in one go.
A. 36 mL of water
B. 5.75 mL of sucrose solution
C. 18.5 mL of NaCl solution
The best measuring cup to take each measurement in one go that is 36 mL of water, 5.75 mL of sucrose solution and 18.5 mL of NaCl solution is the graduated cylinder.
The graduated cylinder chosen same number of decimal places reading capability as the number of decimal places in the volume measured to be measured. For example: for 36ml, we require reading or marking with best reading 1 mL.
For 5.75 mL, we require marking that can tell up to two decimal places so marking should be 0.01 mL or maximum 0.05 mL as 0.01 mL marking is very difficult to read. For 18.5 mL, we require marking should be with reading capability 0.1 mL.
Hence, for 36 mL water we require 50 mL graduated cylinder with marking every 1 mL.For 5.75, of sucrose solution we require 10 mL graduated cylinder with marking every 0.01 mL or marking for every 0.05 mL is also suffix.For 18.5 mL of NaCl solution we require 25 mL graduated cylinder with marking every 0.1 mL.Hence the required measuring cup is graduated cylinder.
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The science department keeps two acid solutions on hand. One is 14% acid and the
other is 46% acid. How much 14% acid solution and how much 46% acid solution need to be mixed to
make 100 gallons of 35.8% acid solution?
34.3gallon of 14% acid solution and 65.7gallon of 46% acid solution need to be mixed to make 100 gallons of 35.8% acid solution.
What is gallon?A gallon is the standard unit of volume indicated by the letter "gal," and it is primarily used to measure liquid quantity inside the customary systems of the United States as well as the Imperial System of measuring of the United Kingdom.
Following the 11th Conference on Measures and Weights in 1960, some countries approved an International System of Units (SI). As a result, this volume measurement unit is replaced by "litre."
0.14×x + 0.46×(100-x)= 0.35×100
0.14x + 46-0.46x=35
-0.32x=35 -46
-0.32x =-11
x=11/ 0.32=34.3gallon
100-34.3=65.7gallon
Therefore, 34.3gallon of 14% acid solution and 65.7gallon of 46% acid solution need to be mixed to make 100 gallons of 35.8% acid solution.
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vitamin c has the formula cxhyoz. you burn 0.281 g of the compound in a combustion analysis chamber and isolate 0.421 g of co2 and 0.114 g of h2o. what is the empirical formula? enter the elements in the order c, h, and o.
The simplest whole-number ratio of the various atoms in a compound is represented by an empirical formula.
What is the simple empirical formula?empirical method a chemical formula, rather than listing the total number of atoms in a molecule, shows the most basic ratio of the components in a compound.
The precise number of various atom types present in a compound's molecule is indicated by the molecular formula. The empirical formula for acetylene is CH. The empirical formula for acetylene is C2H2.
Sample mass equals 0.7789 CO2 mass generated = 1.179
Produced mass of to = 0.3179
C mass in the sample equals [tex]12 x 1.17 44, or 0.3199.[/tex]
Its mass in the sample is equal to [tex]2 x 0.317 18 = 0.0359[/tex]
The sample's mass of is given by [tex]0.778-(0.319+0.035) = 0.424 0.319[/tex].
Divide by 12 H 0.035 0.424 mass their molar and [tex]0.319 0.035 \s0.424 16 \s0.027 \s0.035 \s0.027[/tex]
by the smallest number
[tex]0.027 \s0.027 \s0.035 \s0.027 \s0.027 0.027 \s1.3[/tex]
To express the number 3 4 3 in whole numbers, multiply by 3.
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Match each item with the correct definition.
a. agitation retort
b. aseptic processing
c. canning
d. canning kettle
e. cold-pack
f. hot pack
g. pouch canning
h. pressure processing
i. retort
j. retort canning
k. water-bath processing
An industrial-sized canner that adds movement to foods to enhance heat transfer.
Sealing and sanitizing jars of food at the regular boiling point of water.
Heating and sealing food in containers to preserve and store it.
Processing food in lightweight, sturdy foil containers.
A preservation technique in which the food and the container are sterilized separately.
Sealing and sterilizing canned food in high-temperature, high-pressure environment.
Canning technique in which boiling liquid is added to food in jars, and then sealed.
Large-scale processing that uses industrial pressure canners.
a. agitation retort - An industrial-sized canner that adds movement to foods to enhance heat transfer.
e. cold-pack - Sealing and sanitizing jars of food at the regular boiling point of water.
j. retort canning - Heating and sealing food in containers to preserve and store it.
c. canning - Processing food in lightweight, sturdy foil containers.
b. aseptic processing - A preservation technique in which the food and the container are sterilized separately.
i. retort - Sealing and sterilizing canned food in high-temperature, high-pressure environments.
k. water-bath processing - Canning technique in which boiling liquid is added to food in jars, and then sealed.
h. Pressure processing - Large-scale processing that uses industrial pressure canners.
What is retort canning?All of the air in the container is removed during food canning in a retort. Commercially, a vacuum is produced by first adding steam to a sizable chamber, cooling the steam, and then repeating the process. Although they don't heat the contents, chamber vacuum sealers are an alternative method of creating the vacuum.
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at what stage of the isolation process was magnesium metal separated from benzoic acid? write a one-paragraph explanation. be a specific as you can.
Magnesium metal was separated from benzoic acid in the precipitation stage of the isolation process.
Precipitation is a common method used in chemical separations to form a solid substance from a solution. In this case, magnesium metal was precipitated from a solution containing benzoic acid.
The magnesium metal was likely added to the solution in the form of magnesium oxide or magnesium hydroxide, and an acid was used to react with the magnesium compound to produce magnesium ions and the corresponding anion in solution.
The magnesium ions then combined with a suitable precipitating agent, such as a chloride or sulfate salt, to form solid magnesium metal and a corresponding anion. The solid magnesium metal was then separated from the solution by filtration, leaving the benzoic acid in solution.
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. in a particular experiment, the reaction of 2.5 g of aluminum with 2.5 g of oxygen gas produced 3.5 g of aluminum oxide. the percent yield of the reaction is
The percent yield of the reaction is 70%, since 3.5 g of aluminum oxide is produced when 2.5 g of aluminum reacts with 2.5 g of oxygen gas.
The percent yield of a reaction can be calculated if the amount of product produced and the amount of reactants used are known. First, the theoretical yield of the reaction must be determined. This is calculated by multiplying the amount of reactant used by the mole ratio of the reaction. In the given experiment, 2.5 g of aluminum will react with 2.5 g of oxygen, thus the theoretical yield of aluminum oxide will be 5 g. The actual yield is 3.5 g, so the percent yield of the reaction is determined by dividing the actual yield (3.5 g) by the theoretical yield (5 g) and then multiplying by 100. The result is 70%, meaning 70% of the theoretical yield of the reaction was achieved.
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a 0.500 m sample of phosgene gas, cocl2, decomposes to give carbon monoxide and chlorine gases. if theequilibrium concentration of cl2 is 0.045 m, what is the equilibrium constant for the reaction?
The equation for the decomposition of phosgene gas (COCl₂) to carbon monoxide (CO) and chlorine (Cl₂) is as follows:
COCl₂(g) <=> CO(g) + Cl₂(g)
The equilibrium constant for the reaction can be calculated using the concentration of each species at equilibrium, according to the equation:
Kc = [CO][Cl₂] / [COCl₂]
Since the equilibrium concentration of Cl₂ is 0.045 M, the value of Kc can be calculated as follows:
Kc = [CO][0.045] / [COCl₂]
Note that the concentration of COCl₂ is not known, so the value of Kc cannot be calculated without additional information. To determine the value of Kc, the concentration of COCl₂ at equilibrium is required.
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In a process called electrolysis, an electric current passed through water causes
hydrogen gas and oxygen gas to be evolved. The unbalanced reaction below shows
this process:
2H₂O(1)→ 2H2(g) + O2(g)
If a 0.75 mol sample of water is electrolyzed until all the liquid water is gone, what
volume of oxygen gas is produced at 100°C and 1 atm?
R = 0.08206 L* atm/mol * K
11.5 L
3.08 L
0.375 L
114.8 L
The volume of the oxygen is 11.5 L.
What is the balanced equation?If we have the electrolysis of the water, what we are referring to is the break down of water so as to produce the oxygen molecule and the hydrogen ions as we can see in the reaction equation that has been shown above. We know that in this case we would need to apply the stoichiometry of the balanced reaction equation.
As such we have that;
2 moles of water can produce 1 mole of oxygen
0.75 moles of water can produce 0.75 * 1/2
= 0.375 moles
Using PV = nRT
V = nRT/P
V = 0.375 * 0.08206 * 373/1
= 11.5 L
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Answer:
11.5 L
Explanation:
a sample of a certain monoprotic weak acid was dissolved in water and titrated with 0.125m naoh, requiring 16.00 ml to reach the equivalence point. during the titration, the ph after adding 2.00ml of naoh was 6.912. calculate k a for the weak acid.
A sample of the certain monoprotic weak acid was dissolved in the water and titrated with 0.125 M NaOH. The value of ka for the weak acid is 8.572x10⁻⁷.
The molarity = 0.125 M
The volume = 0.016 L
The number of moles = molarity × volume
The number of moles = 0.125 × 0.016
= 0.002 mol
The moles = molarity × volume
= 0.125 × 0.002
= 0.00025 mol
The remaining moles = 0.002 - 0.00025
= 0.00175 mol
The Henderson - Hasselbach equation is expressed as :
pH = pKa + log [(A⁻)/(HA)]
6.912 = pKa + log[0.00025/0.00175]
6.912 = pKa - 0.845
pKa = 6.067
ka = 8.572x10⁻⁷
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What is the molar mass of Be (CIO3)2?
The molar mass of Be(CIO3)₂ is 176g/mol.
How to calculate molar mass?The molar mass of a substance is the mass of a given substance divided by its amount, measured in moles.
It is commonly expressed in grams (sometimes kilograms) per mole. The molar mass of a substance can be calculated by summing the atomic masses of each element in the substance as follows:
Atomic mass of Be = 9Atomic mass of Cl = 35.5Atomic mass of oxygen = 16Molar mass of Be(CIO₃)₂ = 9 + {35.5 + 16(3)}2
Molar mass = 176g/mol
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What is the percent by mass of oxygen in CH3OH A50.0 B16.0 C32.0 D44.4 With explaining please
The mass percentage is a method to express the concentration of a solution. The mass percentage of oxygen in CH₃OH is 50.0. The correct option is A.
What is mass percentage?The mass percentage of a component in a solution is equal to the mass in grams of that component present per 100 g of the solution. It is denoted by the symbol (w/w).
The equation which is used to calculate the mass percentage is given as:
Mass percentage = Mass of the component / Total mass of the compound × 100
or
Mass percentage = Mole fraction × 100
Here the molar mass of CH₃OH is 32.04 g/ mol. The mass of oxygen is 15. 9. Then,
Mass percentage of 'O' = 15.9 / 32.04 × 100 = 49.62 ≈ 50.0
Thus the Mass percentage of oxygen is 50.0.
Thus the correct option is A.
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