Answer:
5.80 M
Explanation:
In this problem, the solute is NaCl and the solvent is water. To find the molality, you need to (1) convert grams NaCl to moles NaCl (via molar mass), then (2) convert grams H₂O to kilograms H₂O, and then (3) calculate the molality (via molality equation). The final answer should have 3 sig figs to match the sig figs of the given values.
(Step 1)
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
14.3 grams NaCl 1 mole
-------------------------- x ------------------------ = 0.245 moles NaCl
58.443 grams
(Step 2)
1,000 g = 1 kg
42.2 grams H₂O 1 kg
-------------------------- x ----------------------- = 0.0422 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass solvent (kg)
Molality = 0.245 moles NaCl / 0.0422 kg H₂O
Molality = 5.80 M
Select true or false: if 2mg(s) o2(g) → 2mgo(s), δh° = –1203. 6 kj/mol, then formg(s) (1/2)o2(g) → mgo(s), the enthalpy change is δh = –601. 8 kj/mol
According to the given equation ,if 2Mg(s) O2(g) → 2MgO(s), δh° = –1203. 6
k j/m o l, then form g(s) (1/2)O2(g) → Mg O(s), the enthalpy change is δh = –601. 8 k j /m o l, hence the given statement is true.
What do you mean by enthalpy change?An enthalpy change is roughly equivalent to the energy gained through the production of new chemical bonds in a reaction minus the energy required to break existing chemical bonds.
It describes how a system changes in terms of energy while pressure is constant.
The symbol ΔH stands for enthalpy change. At constant pressure, ΔH is equal to the sum of the system's internal energy and the pressure-volume work it performs on its surroundings.
It is expressed in units of joules per mole.
If 2Mg(s) O2(g) → 2MgO(s), δh° = –1203. 6
k j/m o l, then form g(s) (1/2)O2(g) → Mg O(s), the enthalpy change is δh = –601. 8 k j /m o l, therefore the above given statement is true.
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When the solute concentration in solution 1 is lower than the solute concentration in solution 2, solution 2 is:_____.
When the solute concentration in solution 1 is lower than the solute concentration in solution 2, solution 2 is concentrated solution .
The dilute solution and concentrated solution is relative terms.
Now in any solution there are just solute and solvent.
If amount of solute is comparatively high as compare to amount of solvent in solution then solution is called concentrated solution. Similarly , If amount of solute is comparatively low as compare to amount of solvent in solution then solution is called dilute solution.
If the amount of solvent is more in a solution then the amount of solute would be less.Again if the amount of solvent is less in a solution then amount of solute is more.
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In a kitchen, during preparation of food or tea, salt and sugar are
mixed. What methods for separation of this mixture would you
suggest to your mother?
Answer:
A mixture of salt and sugar can be separated by the process of filtration.
What is the reaction product of acetic acid and ethylamine at room temperature?
Ammonium salt of acetic acid is the reaction product of acetic acid and ethylamine at room temperature.
The acetic acid and ethylene amine form salts and this result is expected same as form in the reaction of oxalic acid and ethylene diamine at ambient temperature.
The reaction of acetic acid with ammonium forms ammonium salt of carboxylic acid which on heating undergoes elimination to form amide as acetamine. The salt is form due to deprotonation of acid by the base. The amide is form on heating of the ammonium carboxylate salt. Such type of reaction is called aminooacide reaction.
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The electron transport chain accepts energy-rich electrons from ______ and ______ produced in the previous reactions of aerobic respiration.
The electrons that enter the transport chain come from NADH and FADH.
What happen in electron transport chain?The electron transport chain accepts energy-rich electrons from NADH and FADH 2 whereas ATP is produced in the previous reactions of aerobic respiration. These processes such as glycolysis, the citric acid cycle, the fatty acid beta-oxidation metabolism, and the oxidation of amino acids occurs before electron transport chain. These processes do the function of transfer of electrons and protons to coenzymes.
So we can conclude that the electrons that enter the transport chain come from NADH and FADH.
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What do the electron configurations for all the group 18 noble gases have in common?
Electron configurations for all the group 18 noble gases have eight electrons in their valence shell in common.
Noble gases are the gases that contain Eight electrons in their valence shells and are placed in Group 18 of the periodic table. The octet of Noble gases is complete. They are inert in nature since they have complete valence shells. They are not much abundant in nature due to their inert behaviour.
They are stable and realtively unreactive as compared to other members of the peiodic table.
Some other factors that remain common for noble gases:
High Ionisation energyNegligible ELectronegativityLow boiling pointsPsitive Elevtron gain enthalpyGases at Room temperatureLearn more about Noble gases here,
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calculate the weight of CO having the same number of oxygen atoms as are present in 22g of CO2.
The mass or the weight of the substance is given as the product of moles and molar mass. The weight of CO as the same oxygen atom in carbon dioxide is 28 gm.
What is mass?Mass of the substance has been given by the moles and the molar mass of the substance and also by the Avogadro's number (Na).
It is known that the molar mass of carbon dioxide is 44, and 1 mole of it will contain 44 gm or 6.022 × 10²³ molecules.
In a carbon dioxide molecule oxygen has 2 atoms so,
6.022 x 10²³ molecules of CO₂ = 2 × 6.022 x 10²³ atoms of Oxygen
so, 44g of carbon dioxide = 2 × 6.022 × 10²³ atoms of Oxygen
22 gm of carbon dioxide will also have 6.022 × 10²³ atoms of Oxygen
1 mole of carbon monoxide = 28 gm
So, 28 gm will have 6.022 × 10²³ atoms of Oxygen and will weigh 28 gm.
Therefore, the mass of carbon monoxide is 28 gm.
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Explanation:
1 mol of CO2=12+32=44 g
Number of oxygen in 1 molecule of CO2=2
Therefore, 44 g CO2 contains 2 moles of oxygen
22 g CO2 contains =442×22=1 mole oxygen atom
1 mole of CO=12+16=28 g
∴ 28 g CO contains 1 mol oxygen atom.
When a 0. 1 m aqueous solution of hydrocyanic acid, hcn, reaches equilibrium, the ph is measured to be 5. 20. using this information, calculate ka for hydrocyanic acid
When a 0. 1 m aqueous solution of hydrocyanic acid, HCN, reaches equilibrium, the ka for hydrocyanic acid is 3.969 x 10⁻¹⁰.
What is ka value?It's the value of equilibrium constant for the dissociation of ions into a solution. The more the Ka value the more will be dissociation.
Ka = [H₃O⁺]² / [HCN] [H₃O⁺]
The pH is 5.20
-log [H₃O⁺] = 5.20
Putting antitlog both side.
The value will be 6.30 x 10⁻⁶
Ka = (6.30 x 10⁻⁶)² / 0.1 - 6.30 x 10⁻⁶
0.1 - 6.30 x 10⁻⁶ = 0.1
Ka = 3.969 x 10⁻¹⁰
Thus, the Ka value for hydrocyanic acid is 3.969 x 10⁻¹⁰.
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The energy levels of a quantum particle-in-a-box ______ as the quantum number increases.
Answer:
Explanation:
The energy of a particle in the box increases proportionally to n-squared. This means that the energy spacings increase at high values of n.
The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.
What are Quantum Numbers?Quantum numbers can be used to describe the trajectory and the movement of an electron in an atom.
The set of numbers used to describe the position and energy of an electron in an atom is called quantum numbers.
These are the four quantum numbers, i.e., principal quantum number (n), magnetic quantum number (m), azimuthal quantum number (l), and spin quantum number (s).
As the energy levels of a quantum particle-in-a-box decreases as the quantum number increases.
Therefore, The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.
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If you have 200. 0 g of radioisotope with a half-life of 5 days. How much isotope would remain after 15 days?
If you have 200. 0 g of radioisotope with a half-life of 5 days. 25g of isotope would remain after 15 days
Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons. The atomic number of an element on the Periodic Table is determined by the number of protons in its nucleus. Carbon, for example, has six protons and has atomic number 6.
Radioisotopes are elemental radioactive isotopes. They can alternatively be defined as atoms with an unstable neutron-proton combination or surplus energy in their nucleus.
Radioisotopes are critical components of medical diagnostic techniques. They can be utilized for imaging to examine the dynamic processes taking place in various sections of the body when combined with imaging devices that register the gamma rays emitted from within.
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Draw the structures of the two monomers that react together to form this polyurethane polymer
The monomers that react together to form polyurethane polymer are diisocyanate and diol.
What are polymers?Polymers are a class of natural or synthetic substancesIt is made up of small units called monomers arranged in a repeated pattern to form large molecules called macromoleculesCellulose and resins are examples of natural polymersPolyethylene and polychloroprene are examples of synthetic polymers.Polyurethane polymer is made up of monomers diisocyanate and diol. It is mostly used in home furnishing in flexible form. The structures of monomers are as follows:
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If 20. 3 grams of an aqueous solution of iron(ii) chloride, fecl2, contains 2. 71 grams of iron(ii) chloride, what is the percentage by mass of iron(ii) chloride in the solution?
If 20. 3 grams of an aqueous solution of iron(ii) chloride contains 2. 71 grams of iron(ii) chloride, then percentage by mass of iron(ii) chloride in the solution is 13.34%
Calculation,
Given:
mass of an aqueous solution of iron(ii) chloride = 20. 3 grams
mass of iron(ii) chloride = 2. 71 grams
The percentage by Mass is equal to percentage of mass of solute present in total mass of solution. It is also known as Mass percentage.
percentage by Mass = 100× 2. 71 grams/20. 3 grams = 13.34%
Hence, the percentage by mass of iron(ii) chloride in the solution is 13.34% .
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Landon thinks that taking care of one's family is very important. This is an example of a(n)?
Developing enduring relationships and sensing love - Taking care of others fosters empathy and the capacity to connect with others, especially through trying circumstances. Additionally, 77% of caregivers who are also employed claim that their relationship with their parents and/or in-laws has improved as a result of their caregiving.
Family supports us during both the best and worst of times, which makes these ties crucial. Family is crucial because they can provide unwavering love, support, and stability; they constantly strive to bring out the best in you even when you are unable to perceive it for yourself.
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What is the general term for the process in which a chemical species gains electrons?
Reduction is the general term for the process in which a chemical species gains electrons
The number of electrons attached to an atom or group of atoms increases during a reduction, a type of chemical reaction. One material is provided with electrons by another, which is oxidized as a result of the reduction.
One of the atoms participating in the chemical interaction between two chemicals gains electrons during reduction, which is a type of chemical reaction. The term refers to the element that receives electrons since the element that gains electrons have a lower oxidation state. A chemical species lowers its oxidation number during a half-reaction known as reduction, typically by acquiring electrons.
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Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers. both liquids have a temperature of 24°c. jeff heats both liquids over a flame for five minutes. when he’s finished, he discovers that the temperature of the oil increased more than the temperature of the water. what can jeff conclude from this experiment?
ANSWER: From this experiment, Jeff can conclude that the heat capacity of oil is lower than that of water which means that oil requires less energy per gram of liquid in order to change its temperature.
Calculate the molality of a sulfuric acid solution containing 24. 4 g of sulfuric acid in 198 g of water
Answer:
1.26 m
Explanation:
The molality equation looks like this:
Molality = moles solute / mass solvent (kg)
In this case, sulfuric acid is the solute and water is the solvent. To calculate the molality, you need to (1) convert grams solute to moles solute (via molar mass), then (2) convert grams solvent to kilograms solvent, and then (3) calculate the molality.
(Step 1)
Molar Mass (H₂SO₄): 2(1.008 g/mol) + 32.065 g/mol + 4(15.998 g/mol)
Molar Mass (H₂SO₄): 98.073 g/mol
24.4 grams H₂SO₄ 1 mole
----------------------------- x ------------------------ = 0.249 moles H₂SO₄
98.073 grams
(Step 2)
198 grams H₂O 1 kg
------------------------- x ---------------------- = 0.198 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass solvent
Molality = 0.249 moles H₂SO₄ / 0.198 kg H₂O
Molality = 1.26 m
Why isn't the ph at the equivalence point always equal to 7 in a neutralization titration?
The pH at the equivalence point always not equal to 7 in a neutralization titration when titration occur between weak acid and weak base , strong acid and weak base or strong base weak acid. The reason behind it is given as,
At equivalence point the product is present by reacting from acid and base. So, when weak acid titrate with strong base then the solution will be weak base at equivalence point.When strong acid is neutralize with strong base then it form neutral product at the equivalence point. Hence the final conclusion is that the pH of the solution in which titration is takes place between strong acid and strong base is 7 that is neutral left titration between all type of acids and bases ha pH not equal to 7 .
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Calcium Oxide at mass 14.0g react with water. Determine the mass at which the calcium hydroxide formed. [ Ca=40, O=16, H=1]
A galvanic cell is set up with two cells containing a cadmium electrode in 0. 250 m cd(no3)2 solution and an iron electrode in 0. 050 m fe(no3)2 solution. what is the cell potential at 25 oc?
Cd2+(aq) + 2e- ---> Cd(s) , E° = -0.40 V Fe2+(aq) + 2e- ----> Fe(s) , E° = -0.44 V Since standard reduction potential.
Galvanic Cell: A chemical cell, also known as an electrochemical cell, is a device that transforms the chemical energy generated during a red-ox reaction into electrical energy. In honor of Luigi Galvanic and Alessandro Volta, who conducted the first experiments on the conversion of chemical energy into electrical energy, these are also known as galvanic or voltaic cells.
A spontaneous red-ox reaction occurs in an electrochemical cell in an indirect manner, and the reduction in free energy that occurs during the chemical reaction manifests as electrical energy. In an indirect red-ox reaction, the reduction and oxidation processes take place in two different containers known as half-cells.
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The cell potential is 0.01934 V at 25°C.
What is a galvanic cell?A galvanic cell, also known as a voltaic cell, is an electrochemical cell that converts the chemical energy generated by spontaneous redox reactions into electrical energy.
The main components of a galvanic cell are
Anode – Oxidation occurs at the anode
Cathode – Reduction occurs at the cathode
Salt bridge – consists of electrolytes that are needed to complete the circuit in a galvanic cell.
Half-cells – It is important as reduction and oxidation reactions are separated into compartments.
External circuit – it helps in Conducting the flow of electrons between electrodes
At cathode,
[tex]Cd^{2+}(aq) + 2e^-\rightarrow Cd(s)[/tex]
At anode,
[tex]Fe(s)+2e^-\rightarrow Fe^{2+}(aq)[/tex]
Overall cell reaction
[tex]Fe(s)+Cd^{2+}(aq)\rightarrow Fe^{2+}(aq) + Cd(s)[/tex]
[tex]E^o_{cell} = E^o_{cathode} - E^o_{anode}[/tex]
= -0.40 -(0.44) = 0.04 V
Nernst equation is given by
[tex]E_{cell} = E^o_{cell} - \frac{2.303RT}{nF} logQ[/tex]
At 25°C
[tex]E_{cell} = E^o_{cell} - \frac{0.0592V}{n} logQ[/tex]
Here, n = 2 and log Q = log [tex]\frac{0.250}{0.050}[/tex] = 0.699
[tex]E_{cell}[/tex] = 0.01934 V
The cell potential is 0.01934 V at 25°C
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Tritium, or 3h, has a half-life of 12. 32 years. imagine a sample of tritium is prepared. (a) what fraction of the sample will remain 3. 80 yr after its preparation?
(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.
What is half life?Half life is the time taken for the radioactivity of a substance to fall to half its original value whereas mean life is average lifetime of all the nuclei of a particular unstable atomic species.
So if a radioactive element has a half life of one hour, this means that half of it will decay in one hour. After another hour, half of the remaining material will decay.
Example:
The radioactive isotope cobalt-60, which is used for radiotherapy, has, for example, a half-life of 5.26 years.
Tritium half life = 12.32 (T half)
Formula :
N/N₀ = (1/2) ^ t/T (N/N₀ = Fraction ratio)t = 3.84 T = 12.32N/N₀ = (1/2) ^ 0.308N/N₀ = 0.807(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.
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Which 5-carbon intermediate of the citric acid cycle is converted to a 4-carbon molecule with the release of carbon dioxide?
The alpha- ketoglutarate is the 5-carbon intermediate of the citric acid cycle which converted to a 4-carbon molecule with the release of carbon dioxide
The first decarboxylation reaction in Krebs cycle ( known as citric acid cycle ) is catalyzed by isocitrate dehydrogenase in which one six carbon atoms compound isocitrate is decarboxylated to yield five carbon atom containing alpha ketoglutaric acid.
The alpha- ketoglutarate is the 5-carbon intermediate of the citric acid cycle which is salt of alpha ketoglutaric acid. The last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle.
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A welding torch requires 602.1 L of ethylene gas at 2.77 atm. What will be the pressure of the gas if ethylene is supplied by a 110.6 L tank?
A cylindrical grain has a base radius of 5m. the surface area is 1099m^2. What is the height of the bin to the nearest metre?
The height of the bin is 29.9m.
The quantity of space enclosing a three-dimensional shape's exterior is its surface area.
The total surface area of the cylinder formula is simply the sum of the base surface area and the lateral surface area.
The radius of the cylinder, r = 5m
Surface area = 1099 m²
∴ A = 2πrh + 2πr²
[tex]h = \frac{A- 2\pi r^2}{2\pi r}[/tex]
[tex]h = \frac{1099- 2 (3.141) 5^2}{2 (3.141) 5}[/tex]
[tex]h = \frac{1099- 157.05}{31.41}[/tex]
[tex]h = \frac{941.95}{31.41}[/tex]
[tex]h = 29.9 m[/tex]
Therefore, the height of the bin is 29.9m.
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Aside from the high-energy molecules like atp and nadh, what is the net reaction for the complete oxidation of acetyl-coa in the tca cycle?
Aside from the high-energy molecules like ATP and NaDH . The net reaction for the complete oxidation of acetyl-COA in the TCA cycle is given as ,
Pyruvate → 3[tex]CO_{2}[/tex]
The reaction of the cycle are carried out by eight enzymes that completely oxidize acetate ( a two carbon molecule ) , in the form of acetyl-COA , into two molecules each of carbon dioxide and water . The net yield of one turn of the TCA cycle in terms of energy - containing compounds is one GTP , one FADH2 , and three NADH molecules . The NADH molecules are used in oxidative
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Explain how a redox reaction involves electrons in the same way that a neutralization reaction involves protons.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.In oxidation loss of electrons takes place and in reduction gain of electrons is takes place whereas nuetralization reaction is a reaction in which an acid and a base react to form water and a salt and involves the combination of [tex]H^{+}[/tex] (proton) and [tex]OH^{-}[/tex] to generate water.
The neutralization reaction is not a redox reaction is because in nuetralization reaction there is no transfer of electron takes place where as in redox reaction there is no exchange of electrons between atoms. Moat bond forming and breaking redox reaction requires the concomitant transfer of protons.
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What is the percent yield when 68. 5 kg of carbon monoxide is reacted with 8. 60 kg of hydrogen gas to produce methanol (ch3oh)? the actual yield of methanol was 3. 57 x 104 g
Hence the percent yield of methanol is 51.45%
Step 1: Convert Kg into g
68.5 Kg CO = 68500 g CO
8.60 Kg H₂ = 8600 g
Step 2: Find out the Limiting reactant;
The Balance Chemical Equation is as follows;
CO + 2 H₂ → CH₃OH
According to Equation,
28 g (1 mol) CO reacts with = 4 g (2 mol) of H₂
So,
68500 g CO will react with = X g of H₂
Solving for X,
X = (68500 g × 4 g) ÷ 28 g
X = 9785 g of H₂
It shows that 9785 g H₂ is required to react with 68500 g of CO but we are provided with 8600 g of H₂ which is less than required. Therefore, H₂ is provided in less amount hence, it is a Limiting reagent and will control the yield of products.
Step 3: Calculate Theoretical Yield
According to the equation,
4 g (2 mol) H₂ reacts to produce = 32 g (1 mol) Methanol
So,
8600 g H₂ will produce = X g of CH₃OH
Solving for X,
X = (8600 g × 32 g) ÷ 4 g
X = 68800 g of CH₃OH
Step 4: Calculate %age Yield
%age Yield = Actual Yield ÷ Theoretical Yield × 100
Putting Values,
%age Yield = 3.54 × 10⁴ g ÷ 68800 g × 100 = 51.45 %
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The bluish color that makes the atmosphere of neptune so beautiful to the human eye is caused by the interaction of sunlight with what gas?
The bluish color that makes the atmosphere of neptune so beautiful to the human eye is caused by the interaction of sunlight with methane gas.
The compositions of Uranus but also Neptune are fairly similar at high altitudes. The existence of methane in both ice giants' upper atmospheres may be responsible for their blue hue. The majority of the red light that strikes the planets is absorbed by methane, giving the planets their blue appearance.
The blue marble occurrence of the faraway planet is actually a result of methane gas clouds. Methane is a gas that, despite making up a very small fraction of Neptune's atmosphere, absorbing red light's wavelengths while reflecting blue light outward.
Therefore, the bluish color that makes the atmosphere of neptune so beautiful to the human eye is caused by the interaction of sunlight with methane gas.
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In the molecular orbital model of cyclobutadiene, how many -antibonding molecular orbitals are there?
There are one antibonding molecular orbitals present in molecular orbital model of c.
The cyclobutadiene has a pi system comprised of four individual atomic p - orbital and thus should have a four pi molecular orbitals. The compound is the prototypical antiaromatic hydrocarbon with 4 [tex]\pi[/tex] - electrons . Its rectangular structure is the result of jahn teller reaction which disorder the molecule and lowers its symmetry , converting the triplet to a singlet ground state. It is a small annulene . The delocalisation energy of the [tex]\pi[/tex] electrons of the cyclobutene is predicted to be zero .
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Malic dehydrogenase is added to the aspartate aminotransferase (ast) reaction to catalyze the conversion of?
Malic dehydrogenase catalyzes the conversion of oxaloacetate to malate.
What is the mechanism of aspartate aminotransferase reaction?The transaminase enzyme known as aspartate aminotransferase (AST) is responsible for converting aspartate and alpha-ketoglutarate into oxaloacetate and glutamate.
Malate Dehydrogenase catalyzes Oxaloacetate to Malate Oxidation in the Coupled Reaction of AST Measurement.
What is the reaction of aspartate aminotransferase
I understand the question you are looking for is this:
Malic dehydrogenase is added to the aspartate aminotransaminase (AST) reaction to catalyze the conversion of:
a. alpha-ketoglutarate to aspartate
b. alpha-ketoglutarate to malate
c. aspartate to oxaloacetate
d. oxaloacetate to malate
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You're going on a plane from Alaska to Florida and you're taking your bike. It's the middle of the winter. You fill up your tires before you leave to a pressure of 2.72
atm on a day that is -7.50°C. When you arrive in FL at 38°C, you check the pressure in your tires before you ride, what do you find the pressure to be?
Type your answer with the proper number of significant figures and proper units in the space below.
Answer:
2.3 atm
Explanation:
-7.50°C = 265.5 K
38°C = 315 K
(2.72)(265.5)=(pressure)(315)
pressure = 2.3 atm