Protons that are present are in an isotope of sodium with a mass number of 25 are a.) 11. Hence, option a) is correct.
What do you understand by isotope?Isotopes are two or more types of atoms that have same atomic number and position in the periodic table, but that differ in nucleon numbers due to the different numbers of neutrons in their nuclei.
Atoms with same number of protons and different numbers of neutrons are known as isotopes. They share almost same chemical properties but have different mass and therefore different physical properties. Example: carbon 12, carbon 13, and carbon 14 are all isotopes of carbon.
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Put the steps of the Edman degradation in the correct order (not all the steps are used): Indentify the phenylthiohydantion Extract the derivatized amino acid treat with 6M HCl Treat with phenyl isothiocyanate Treat with triflouroacetic acid Treat with dinitroflourobenzene
1. Identify the phenylthiohydantion: This step involves identifying the amino acid to be degraded using an appropriate reagent that will react with the amino acid to form a new compound called a phenylthiohydantoin.
What is phenylthiohydantoin ?Phenylthiohydantion (PTH) is a chemical compound that is used as a reactant in organic synthesis.
2. Extract the derivatized amino acid: This involves extracting the phenylthiohydantion from the reaction mixture by using an appropriate solvent.
3. Treat with 6M HCl: This step involves treating the extracted phenylthiohydantion with 6M HCl, which will cleave the peptide bond and produce the free amino acid and a thiohydantoin derivative.
4. Treat with phenyl isothiocyanate: This step involves treating the thiohydantoin derivative with phenyl isothiocyanate, which will form a phenylthiocarbamoyl derivative.
5. Treat with trifluoroacetic acid: This step involves treating the phenylthiocarbamoyl derivative with trifluoroacetic acid, which will hydrolyze the derivative and release the amino acid as a phenylthiohydantoin derivative.
6. Treat with dinitrofluorobenzene: This step involves treating the phenylthiohydantoin derivative with dinitrofluorobenzene, which will further degrade the derivative into its component parts.
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does an identical cylinder with the same pressure of hydrogen contain more molecules than a cylinder of oxygen because hydrogen molescules are smaller
An identical cylinder containing hydrogen at the same pressure as a cylinder containing oxygen will contain more hydrogen molecules because hydrogen gas (H2) has a lower molar mass than oxygen gas (O2). This means that there are more H2 molecules in a given volume at a given pressure, as compared to O2.
Because hydrogen gas (H2) has a smaller molar mass than oxygen gas, an identical cylinder holding hydrogen at the same pressure will hold more hydrogen molecules (O2). This indicates that compared to O2, there are more H2 molecules in a given volume at a given pressure.
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Look at the picture below.
What does this picture represent?
A. Atoms that are ions
B. Atoms with a covalent bond
C. Atoms with no bond
D. Atoms with
The picture below represents atoms with a covalent bond. Option B is the correct answer.
In order to maintain stability, covalent bonds, a particular kind of chemical link, form between hydrogen atoms, nonmetals, and semimetals. The exchange of one or more pairs of electrons between two atoms forms a covalent connection. The two atomic nuclei are drawing these electrons in unison.
When there is insufficient space between two atoms' electronegativities for an electron transfer to take place and create ions, a covalent bond is formed. In organic chemistry, covalent bonds predominate over ionic bonds by a wide margin.
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The complete question is:
Look at the picture below.
What does this picture represent?
A. Atoms that are ions
B. Atoms with a covalent bond
C. Atoms with no bond
D. Atoms with
If the pressure of each gas is increased at constant temperature until condensation occurs, which gas will condense at the lowest pressure?
A) Octane
B) Ethane
C) Butane
D) All the gases will condense at the same pressure
If the pressure of the each gas is increased at a constant temperature until condensation occurs, Then a) octane will condense at the lowest pressure.
Condensation is the process by which water vapor in the air is converted to liquid water. It is the opposite of evaporation. Condensation is essential for the water cycle as it causes the formation of clouds. Condensation is the process by which the physical state of matter changes from the gas phase to the liquid phase. For example, condensation occurs when water vapor (a gas) in the air contacts a cooler surface and turns into liquid water. Octane is a gasoline additive that modern engines need to function properly. Sources of octane have taken many forms over the years. Ocatne will condense at the lowest pressure.
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A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of ruthenium in these samples:
In general, the mass m of each isotope times its natural abundance p yields the atomic mass A of an element, which can be calculated by adding the resulting numbers: 44\sRu\s99.9
What does atomic mass mean?The average mass of an element's atoms expressed in atomic mass units is known as its atomic mass (amu, also known as daltons, D). The atomic mass of an element is a weighted average of all of its isotopes and is calculated by multiplying each isotope's mass by its abundance.
What is meant by an atomic number?The periodic system, which arranges the elements in increasing order of the number of protons in their nuclei, uses each element's atomic number to identify it. Because there are always the same number of protons and electrons in a neutral atom, the number of protons also determines the atomic number.
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two flexible containers for gases are at the same temperature and pressure. one holds 0.50 grams of hydrogen and the other holds 8.0 grams of oxygen. which is false?
A) The volume of hydrogen container is the same as the volume of the oxygen container. This statement is false for the given gases are at the same temperature and pressure.
What is the explanation to the false statement for the given gases hydrogen and oxygen?According to the ideal gas law PV = nRT, the volume of a gas sample is proportional to the number of moles of the gas present, assuming that the pressure and temperature are constant. Since the number of moles of hydrogen is much less than the number of moles of oxygen (0.50 grams of hydrogen is roughly equivalent to 0.01 moles while 8.0 grams of oxygen is roughly equivalent to 0.2 moles), the volume of the hydrogen container would be much smaller than the volume of the oxygen container.
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two flexible containers for gases are at the same temperature and pressure. one holds 0.50 grams of hydrogen and the other holds 8.0 grams of oxygen. which of the following statement regarding these gas samples is false?
A)the volume of hydrogen container is the same as the volume of the oxygen container
B) the number of molecules in the hydrogen container is the same as the number of molecules in the oxygen container
C) the density of hydrogen sample is less than that of oxygen sample
D) the average kinetic energy of the hydrogen molecules is the same as the average kinetic energy of the oxygen molecules
E) The average speed of hydrogen molecules is the same as the oxygen molecules
if 17.04 g n2 is mixed with 8.160 g h2, calculate the theoretical yield (g) of nh3 produced by the reaction.
the theoretical yield (g) of nh3 produced by the reaction if 17.04 g n2 is mixed with 8.160 g h2 , is 20.66g
The theoretical yield of NH3 produced by the reaction of 17.04g of N2 and 8.160g of H2 can be calculated using the balanced equation for the reaction: N2 + 3H2 --> 2NH3. To calculate the theoretical yield, we need to determine how many moles of NH3 will be produced from the given amounts of N2 and H2. First, we convert the given masses of N2 and H2 to moles. For N2: 17.04 g / 28.02 g/mol = 0.608 mol. For H2: 8.160 g / 2.016 g/mol = 4.04 molSince the balanced equation states that the reaction requires 3 moles of H2 for every 1 mole of N2, we can use the ratio of moles of H2 to moles of N2 to determine how much N2 is needed. 4.04 mol H2 / 3 mol H2/1 mol N2 = 1.34 mol N2. Since we have 0.608 mol of N2 and we need 1.34 mol of N2, we can't produce NH3 using all the N2, so we use the amount of N2 we have and find how much NH3 we can produce.0.608 mol N2 * 2 mol NH3/1 mol N2 = 1.216 mol NH3. To convert the moles of NH3 back to mass, we use the molar mass of NH3 (17.03 g/mol). 1.216 mol NH3 * 17.03 g/mol = 20.66 g NH3. So the theoretical yield of NH3 produced is 20.66 g.
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What factor does not play an important a significant role in the extent of harm upon exposure to a chemical? (a) Dose (b) Length of exposure (c) State (d) Path of exposure
State not play an important a significant role in the extent of harm upon exposure to a chemical.
What is meant by chemical?
Any material with a known composition is a chemical. To put it another way, a chemical always consists of the same "substance."There are some substances in nature, like water. Chlorine and other chemicals are made at factories.Examples of flammable liquids include benzene, dimethylformamide, acetonitrile, hexane, and pyridine. Other examples include methanol, ethanol, acetone, xylene, toluene, ethyl acetate, and tetrahydrofuran.All of these things are made of chemicals, some natural and others synthetic, including air, water, iron, fuel, clothing, stones, furniture, plastics, plants, and food.Chemicals can be made up of several different chemicals or they can be single chemical molecules like water. Nitrogen, oxygen, water, carbon dioxide, and other substances are all present in air.To learn more about chemical refer to
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Part A - CI - I - OH - C2H5 Rank from largest to smallest. To rank items as equivalent, overlap them.
As atomic number increases, priorities rise. Iodine is therefore given precedence over bromine, oxygen is given less importance. Carbon has a lower priority than oxygen since it has a lower atomic number.
What is carbon?All life on Earth depends on carbon for its chemical structure. The amount of carbon that exists on Earth now is the same as it has always been. Carbon creates essential compounds like protein and DNA when new life is created. Additionally, it can be found in our atmosphere as carbon dioxide, or CO2.
What components makes up carbon?The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first two electrons must occupy the innermost atomic orbital, while the wavefunctions of the following four electrons only partially fill the second standard and three second principal orbitals.
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Refer to the hydrogen isotopes in Model 1. Each isotope has a special name derived from Latin (protium, deuterium, and tritium). What structural feature do these names refer to in the atom
The structural feature that gives isotopes special names like protium, deuterium, and tritium refers to the number of neutrons each isotope has.
Protium is the most common and stable form of hydrogen, it has one proton and no neutrons in its nucleus.
Deuterium is a stable isotope of hydrogen that has one proton and one neutron in its nucleus.
Tritium is a radioactive isotope of hydrogen that has one proton and two neutrons in its nucleus.In summary, protium refers to the number of protons in the nucleus, deuterium refers to the number of neutrons and protons in the nucleus and tritium refers to the number of neutrons in the nucleus.
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what volume of 0.210 m ethanol solution contains each of the following number of moles of ethanol?
0.47 mol ethanol
1.24 mol ethanol
1.3×10−2 mol ethanol
a) 0.47 mol ethanol having volume about 2.24 liters.
b) 1.24 mol ethanol having volume about 5.9L.
c) 1.3×10⁻² mol ethanol having volume about 0.062L.
How many moles are there in the formula?The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that substance determines the number of moles of that substance. The Avogadro number, or 6.023×10²³, is equal to one mole of any substance.
We have 0.210M ethanol solution
Molarity = no of moles /v in ml
0.47 mol ethanol
0.210M = 0.47/ /v in liters
v in liters = 0.47/0.210
v in liters = 2.24 liters
1.24 mol ethanol
0.210M = 1.24/ /v in liters
v in liters = 1.24/0.210
v in liters = 5.9L
1.3×10⁻² mol ethanol
0.210M = 1.3×10⁻² /v in liters
v in liters = 1.3×10⁻²/ 0.210m
v in liters = 0.062L or 62ml.
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a chemist has one solution that is 10% salt and 90% water and another solution that is only 2% salt. how many milliliters of each should the chemist use to make 1400 ml of a solution that is 6% salt? solution
700 ml of 10% salt solution and 700 ml of 90% water should the chemist use to make 1400 ml of a solution that is 6% salt.
What is solution?In chemistry, a solution is a homogeneous combination of two or more compounds in their relative proportions. The composition of the solution can be continually changed up to the solubility limit. Although the term "solution" is frequently used to refer to the liquid state of matter, mixtures of gases and solids are also possible.
When one material dissolves, or separates into another, a solution is created. Solute refers to the material that dissolves to create a solution. A solvent is a substance that helps a solute dissolve. Water serves as the solvent and sugar as the solute in a sugar-water solution.
Given that,
Total solution = 1400 ml
now, x + y = 1400 ....... (i)
Here, x = salt in ml
y = water in ml
Next, 10% salt and 90% water for one solution
another solution that is only 2% salt
Thus, 0.1x + 0.02y = 1400
x + 0.2y = 840 ....... (ii)
Now, from equation (i) and (ii) we get -
0.8 y = 560
or, y = 700 ml
now, x = 1400 - y
or, x = 700 ml
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upon reacting a solution of silver nitrate and copper metal yield 0.0175 mles of solid silver. what is the mass of this product
Answer:
2.009315 grams
Explanation:
0.0175 moles is equal to 2.009315 grams.
what is the molarity of a solution prepared by dissolving 2.0 g n a o h 2.0 g naoh in water to make a total solution volume of 250 ml 250 ml?
The molarity of the solution will be 0.4M.
The unit of measurement for a chemical compound is the mole. The term "molarity" in science refers to a substance's concentration, which is determined by dividing its molecular mass by the volume of the solution it is in.
As given,
Weight of NaOH = 4g
Molecular weight of NaOH = 40 G
Volume of the solution is 250ml
Molarity = ?
M = (W / MW ) × (1000 / V(in ml))
M = ( 4 / 40) × (1000 / 250)
0.4M
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for the neutralization reaction below in which a strong base is reacted with a strong acid lioh hcl --> h2o na cl- how many grams of lithium hydroxide are needed to completely neutralize 500 ml of a 0.2 m solution of hcl?
2.395 grams of lithium hydroxide are needed to completely neutralize 500 ml of a 0.2 m solution of HCl.
What do you mean by neutralization reaction?A chemical reaction between an acid and a base that results in a more neutral solution is known as a neutralization reaction. The strength of the acid and base used in the reaction determines the pH of the solution.
For the neutralization reaction: LiOH + HCl -> H2O + NaCl
To find the number of moles of HCl present in the solution:
0.2M * 0.5L = 0.1 moles of HCl
As the reaction is a neutralization reaction, the number of moles of HCl will be equal to the number of moles of LiOH used in the reaction.
Now, we know the number of moles of LiOH used in the reaction is 0.1 moles.
To find the mass of LiOH used in the reaction, we can use the formula: mass = moles * molar mass
The molar mass of LiOH is 23.95 g/mol.
mass = 0.1 moles * 23.95 g/mol = 2.395 g of LiOH.
Therefore, 2.395 grams of lithium hydroxide are needed to completely neutralize 500 ml of a 0.2 m solution of HCl.
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What are the numbers of neutrons of the first 20 elements
The discrepancy between the atomic masses and the masses number of the atomic (M) is equal to the amount of neutrons (Z).
What function does a neutron serve?In contrast to the hydrogen nucleus, which has a single proton, neutrons are necessary for the durability of nuclei. Nuclear fusion or fission generate a ton of neutrons. Through fusion, fusion, and spontaneous fission processes, they are a major contributor to the planetary formation of fundamental particles within stars.
Hydrogen = 0 neutrons
Helium = 2 neutron
lithium=4 neutron
beryllium=5 neutron
boron = 6 neutron
carbon = 6neutron
nitrogen=7n
oxygen= 8n
fluorine= 10n
neon= 10n
sodium= 12n
magnesium= 12n
aluminum = 14 n
silicon= 14n
phosphorus= 16n
sulphur= 16n
chlorine= 18 n
argon= 22 n
potassium= 20n
calcium= 20n
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In the 1950s, the scientists Alfred Hershey and Martha Chase carried out an experiment using bacteriophages, which are viruses that infect bacteria. During the experiment, the scientists allowed bacteriophages that had been labeled with either radioactive phosphorus or radioactive sulfur to infect bacterial cells. After the infection process occurred, the scientists determined the locations of the radioactive elements.
After carrying out their experiment, the scientists concluded that bacteriophages inject DNA (a type of nucleic acid), but not protein, into host bacterial cells during infection.
Based on the scientists' conclusion, which of the following describes the most likely result of the experiment?
The scientists would likely find that the radioactive phosphorus was located inside the host bacterial cells and the radioactive sulfur was located outside the host bacterial cells.
What is bacterial cells?Bacterial cells are single-celled organisms that are found in a wide variety of habitats. They are prokaryotic, meaning they do not have a nucleus or other organelles. Instead, their genetic material is contained in a single circular chromosome, which is found within the cytoplasm. Bacterial cells contain a variety of structures, including cell walls, flagella, and pili, which help them to move, attach to surfaces, and communicate with other cells.
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Ammonia, NH3, is a weak base with a Kb value of 1.8×10−5. What is the pH of a 0.205 M ammonia solution?
A weak base, ammonia solution will dissociate into: NH3 + H2O. Initial combination: NH4+ + OH- , The pH of a 0.205 M ammonia solutionpH = 11.3
How harmful is ammonia?Quite poisonous is ammonia. Lungs, eyes, & skin can become seriously corroded by it. Ammonia poisoning can potentially lethal. Ammonia can injure people permanently by causing blindness and lung issues, for example.
Why would someone use ammonia?Approximately 80% of a ammonia produced from industry is used as fertilizer in agriculture. In addition to these uses, ammonia is also employed in the production of polymers, explosives, textiles, insecticides, dyes, and other compounds. It also serves as a refrigerant gas.
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Under a pressure of 3000Nm^-2, a gas has a volume of 250cm³. What will its volume be if the pressure is changed to 1000mmHg at the same temperature? (760mmHg= 101325Nm^-2)
A new volume of 80ml results from changing the pressure to 1000mm Hg.
How do you calculate volume after pressure change?PV=nRT under the ideal gas law P V = n R T, where P is pressure, V is volume, n is the molecular mass, R is the constant of universal gas, and T is the temperature.The ideal gas law, PV = nRT, is a specific example of these laws, where P is the gas's pressure, V is its volume, n is the number of moles in the gas, T is the gas' kelvin temperature, and R is the ideal gas constant.For instance, if you wish to determine the volume of 40 moles of a gas at a temperature of 250 K and a pressure of 1013 hPa, the formula is V = nRT/p = 40 * 8.31446261815324 * 250 / 101300 = 0.82 m3.To learn more about pressure refer to:
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Which pairs of elements are likely to form ionic bonds and which pairs are likely to form covalent bonds?
A. P and S
B. Li and Br
C. K and F
D. Mg and O
The pairs of elements which forms covalent bonds. P and S are the elements which forms iconic bond are D. Mg and o.
An ionic bond that is produced between metallic and non-metallic atoms, here the electrons are completely transferred from one atom to another in this process. During this process, one atom loses electrons and another one gains them in this process, forming ions. The metal gives up the electrons forming a cation which results in nonmetal element, which forms an anion. In this process the octet rule is fulfilled which means that this rule states that each atom in a molecule requires 8 valence electrons (in the last layer) to remain stable.
The covalent bond can be defined as the chemical bond between atoms where electrons are shared, forming a unit called molecule. Covalent bonds are the ones that are established between non-metallic elements, like hydrogen H, oxygen O and chlorine Cl. These elements have electrons in the outermost level and have a tendency to gain electro which acquire the stability of the electronic structure of the noble gas like He. In other words, sharing electrons, non-metallic elements must lose or gain in order to comply with the Octet rule.
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Consider the ionization energy (IE) of the magnesium atom. Which of the following is not true? Select one: a. The IE of Mg is lower than that of sodium. b. The IE of Mg is lower than that of neon. c. The IE of Mg is lower than that of beryllium. d. The le of Mg is higher than that of calcium. e. The IE of Mg is lower than that of Mgt.
d. The IE of Mg is higher than that of calcium is not true for the the ionization energy (IE) of the magnesium atom.
What is an ionization energy defined for the magnesium atom?The ionization energy (IE) of an atom is the energy required to remove an electron from the atom. The IE of magnesium (Mg) is lower than that of sodium and neon, but higher than that of beryllium. The IE of Mg is lower than that of Mgt (Which is not an element) and higher than that of calcium.
What is difference between Mg and Ca based on their properties?Mg and Ca are both located in the same group (group 2) in the periodic table and have similar electron configurations. However, the IE of Mg is higher than that of Ca because the valence electrons in Mg are held more tightly than in Ca due to the increase in the effective nuclear charge.
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Electrons are charged particles_ The amount of charge that passes per unit time is called The driving force for the electrons (i.e _ the reason they are flowing in the first place) is measured by potential. voltage. current: charge: potential: current: Charge is measured in Current is measured in joules (J) volts (V) amperes (A) volts (V) coulombs (C) coulombs (C): amperes (A) joules (J) Potential is measured in amperes (A) joules (J) coulombs (C) volts (V)
The smallest elemental component of an atom, the electron has a negative charge.
The correct option are:
1. (b) current
2. (c) potential
3. (b) coulombs (C)
4. (a) amperes (A)
5. (d) volts (V)
Particles like electrons and protons have electric charge as one of their properties. Protons and electrons are positively and negatively charged subatomic particles, respectively.
Coulomb, represented by the letter C, is a unit of measure for an object's electric charge.
The net flow of electric charges through a specific area per unit of time is known as current or electric current. The unit of measurement for electrical current is the ampere, or A.
Possibility or The effort put forth to transfer electric charges from one location to another is referred to as electric potential. Potential, represented by the letter V and measured in volts, is what drives the movement of charges.
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Use the data given below to construct a Born-Haber cycle to determine the bond energy of O2.
\Delta H°(kJ)
Na(s) --> Na(g) 107
Na(g) --> Na+(g) + e- 496
O(g) + e- --> O-(g) -141
O-(g) + e- --> O2-(g) 878
2 Na(s) + 1/2O2(g) --> Na2O(s) -416
2 Na+(g) + O2-(g) --> Na2O(s) -2608
Answer Options:
a. 426 kJ
b. 852 kJ
c. 498 kJ
d. 356 kJ
e. 249 kJ
O2 has a -498 kJ/mol bond energy.
How do you define bond energy and its unit?Measure of Bond Energy
The symbol for it is typically H. Bond energy is measured in kcal/mol, often known as kJ/mol, or kilojoule/mol. It should be noticed that the bond energy is consistently positive. The favourable indication results from the energy being supplied to disrupt the chemical bonds.
What does bond enthalpy refer to?Bond enthalpy, often referred to as bond-dissociation enthalpy, average bond energy, or bond strength, is a term used to indicate how much energy is held in a bond between atoms in a molecule. In particular, it refers to the additional energy required for the homolytic or symmetrical cleavage of a bond in the gas phase.
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briefly describe how uranium-235 can be made unstable. write a nuclear equation to represent this process
The nuclear fission of U-235 is a process of radioactive decay in which the heavy nucleus of Uranium-235 which absorbs a neutron first and then it ultimately converts into a an unstable nucleus of Uranium-236 which eventually bifurcates into the lighter elements and additional neutrons.
One of the fissile isotopes that undergo an important and crucial nuclear fission reactions is U-235 which in turn forms a chain reaction. A nuclear fission can be defined as a process of radioactive decay where a heavier nucleus splits further into the two or more lighter elements by absorbing a neutron and releasing its multiples along with great amount of energy.
Taking up the example of Uranium-235, when it's bombarded with small neutrons, the nucleus of U-235 absorbs one of them and turns to heavier U-236 which remains unstable for an infinitesimal time. This U-236, undergoes a phase where fission occurs and it releases three neutrons and produce Kr-92 and Ba-141 along with enormous amount of energy and gamma rays.
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You are developing a solution on Microsoft Azure. The data at rest layer must meet the following requirements:
Encryption at rest using AES-256
Automatic key rotation every 90 days
Compliance with SOC 2, SOC 3, PCI DSS, and HIPAA standards
Azure Disk Encryption is a good solution to encrypt data at rest using AES-256 and automatic key rotation every 90 days. Azure also has certifications for SOC 2, SOC 3, PCI DSS, and HIPAA, so using Azure services can help you meet those compliance standards. Another solution to consider is Azure Key Vault, which allows you to manage and rotate encryption keys for data at rest, and can also help with compliance requirements.
the structure of crestor (rosuvastatin), a medication used to reduce cholesterol, is shown. if the specific rotation for this compound is known to be 100, what would be the specific rotation for the stereoisomer shown at the right?
Rosuvastatin is a dihydroxymonocarboxylic acid that is used to treat (6E) -7-{4-(4-fluorophenyl)-2-[methyl(methylsulfonyl)amino] Two hydroxy substituents are present at positions 3 and 5 in the compound 6-(propan-2-yl)pyrimidin-5-yl hept-6-enoic acid (the 3R,5S-diastereomer).
What kind of medication is rosuvastatin?Since its introduction, rosuvastatin has lived up to its initial expectations as a very effective statin that has positive effects on HDL, demonstrates a decline or cessation in the atherosclerotic burden, and lowers cardiovascular events in reduced patients.
When should rosuvastatin be taken?Rosuvastatin is typically used once daily. Since you can use it whenever you choose, it's better to consume it at the exact hour each day. Taken with or without food, rosuvastatin typically won't make you feel sick.
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The empirical formula of a compound is C5H7O. What is the molecular formula if the molecular mass is 249.3 g/mol.
Answer:The molecular formula is C5 H10 O5 .
Explanation:
A 0.100 M solution of ethylamine (C2H5NH2) has a pH of 11.87. Calculate the Kb for ethylamine.
According to the question: the Kb for ethylamine is 7.59 x 10^-14.
What is ethylamine?Ethylamine is an organic compound with a chemical formula of C2H7N. It is a colorless liquid with an ammonia-like odor.
Kb is the acid dissociation constant for bases. It is defined as the equilibrium constant for the reaction in which a base reacts with water to form its conjugate acid and hydroxide ions:
B + H2O → HB+ + OH-
The Kb for ethylamine can be calculated using the equation:
Kb = [HB+][OH-] / [B]
For a 0.100 M solution of ethylamine, the concentration of ethylamine is 0.100 M and the pH is 11.87.
First, we need to calculate the concentration of hydroxide ions ([OH-]) from the pH.
The pH of a solution is equal to the negative logarithm of the molar concentration of hydrogen ions ([H+]):
pH = -log[H+]
Therefore, the molar concentration of hydroxide ions ([OH-]) can be calculated as:
[OH-] = 10^-pH = 10^-11.87 = 7.59 x 10^-12 M
Now, we can calculate the Kb for ethylamine as:
Kb = [HB+][OH-] / [B]
= (7.59 x 10^-12 M) / (0.100 M)
= 7.59 x 10^-14
Therefore, the Kb for ethylamine is 7.59 x 10^-14.
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the empirical formula of a compound is SF6, and molar mass is 146.06g/ mol. find its molecular formula
Answer:
the molecular formula = SF6
Explanation:
firstly we have to list the firmulas we r goin to use to work out the molecular formula.
n=mass of compound ÷mass of empirical formulamolecula formula=n×empirical formulanow we use the 1st formula to find n which will be substituted into the molecular formula
We are going to take the mass we have been given in the question as the mass of the compound and substitute it to the formula.
Then we will work out the mass of empirical formula for the compound: Sulphur; 32 flourine;19 SF6_ 32+6(19)=146
now we finish off n
n=146.06÷146=1.000410959n=1Lastly we work out the molecula formula
mf=(S1F6)1 ;S 1×1=1 ;F 1×6=6mf=SF6the final answer will therefore be SF6
C4 quiz
Sodium chloride can be made as follows: 2Na + Cl2 → 2NaCl
Calculate the maximum amount of NaCl possible if 2.3 g of sodium was reacted with excess chlorine. Show all your workings
(Ar Na = 23, Ar Cl = 35.5)
The maximum amount of NaCl possible would be 5.85 grams.
Stoichiometric problemFrom the balanced equation of the reaction, the mole ratio of sodium that reacts to sodium chloride that is formed is 1:1. Thus, the first thing would be to convert the mass of the sodium given to its mole equivalent.
Mole = mass/molar mass
Mole of 2.3 g sodium = 2.3/23 = 0.1 mol
Since the mole equivalent of the sodium that reacts is 0.1, the mole equivalent of the sodium chloride that is produced will also be 0.1 since the mole ratio is 1:1.
Thus, the mass of 0.1 mol sodium chloride can be deduced as follows:
Mass = mole x molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of 0.1 mo of NaCl = 0.1 x 58.5
= 5.85 grams.
In other words, the maximum amount of sodium chloride that can be formed from the reaction of 2.3 g of sodium with excess chrlorine will be 5.85 grams.
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