Answer:
10 pts
Explanation:
a container with 3.00 moles of gas has a volume of 60.0 l. with a temperature at 400.k, what is the pressure in atm? your answer should have three significant figures (round your answer to two decimal places). use r
The pressure of the gas inside the container is 1.6 atm. .This is calculated by the ideal gas law.
Ideal gas law states that the pressure of ideal gas is directly proportional to the absolute temperature of the gas. The ideal gas law also called the general gas equation. This is the equation of state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions . The expression for ideal gas law is,
PV = nRT
where, P is the pressure of the gas
V is the volume of the gas
n is the number of moles of the gas
T is the temperature of the gas
A container with 3.00 moles of gas has a volume of 60.0L with a temperature at 400 K. To find the pressure of the gas we have to apply all these value in ideal gas law.
n = 3.0 moles
V = 60.0 L
T = 400 K
From PV = nRT,
P = n RT / V
= (3.0 mole) (0.0821 L-atm. /K-mole)(400 K) / 60.0L
= 1.642 atm.
= 1.6 atm.
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Solution A (pH 4); Solution B (pH 2)
Which one has more H+ ions?
Which one has less OH-ions?
Which one is more basic?
Which one is more acidic?
Solution B (pH 2) has more H+ ions
Solution B (pH2) has less OH- ions
Solution A (pH4) is more basic
Solution B (pH2) is more acidic
What is pH?pH is a measure of hydrogen ion concentration, which indicates whether a solution is acidic or alkaline. The pH scale is typically 0 to 14. Aqueous solutions with a pH less than 7 at 25°C are acidic, whereas solutions with a pH greater than 7 are basic or alkaline.
In aqueous solution, acids and bases release H+ ions and OH- ions, respectively, according to Arrhenius theory. Their relative strengths, however, are expressed in terms of pH value, which is the negative logarithm of H+ ion concentration. In fact, there is a pH scale that ranges from zero to fourteen. A solution with a pH less than 7 is considered acidic, while one with a pH greater than 7 is considered basic. It should be noted that the pH of a solution decreases as it becomes more acidic. A solution is more alkaline the greater its pH value.
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how many milliliters of a 0.900% (m/v) normal saline solution can be prepared from 2.50 g of sodium chloride, nacl ? note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v).
0.0225 ml of a 0.900% (m/v) normal saline solution can be prepared from 2.50 g of sodium chloride, nacl . note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v).
C = m/V
0.009 = m/V
0.009 = 2.5/V
V = 2.5/0.009 = 0.0225 ml
To help prevent heat cramps brought on by excessive sweating, sodium chloride is used as an electrolyte replenisher. The normal isotonic solution of sodium chloride can also be made using this medication. This medication is accessible over-the-counter.
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if one atmosphere of pressure is equal to 760 torr, a pressure of 705 torr is equal to what value in atmospheres (atm)?
If one atmosphere of pressure is equal to 760 torr, a pressure of 705 torr is equal to value in atmospheres is 0.96 atm
1 atm = 760 torr
So, 734 torr = (1 atm) (734 torr) /(760 torr)
= 0.96 atm
According to the kinetic theory of gases, gas particles are always in motion and clashing with one another and the container walls they are held in. Although collisions with container walls are elastic (i.e., there is no net energy gain or loss due to the collision), a gas particle does exert a force on the wall during the contact. Pressure is created by the buildup of all these forces, which are dispersed throughout the container's walls. By dividing the total force of all gas particle/wall collisions by the area of the wall, one can calculate pressure (P):
One of the basic measurably present quantities of this phase of matter, pressure, is an effect that all gases have.
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if you have a complex ion in aqueous solution and the solutionis yellow, what is the approximate wavelength of visible light thatis being most effectively absorbed by the complex?
Answer:
10 pts
Explanation:
what volume of dinitrogen pentoxide gas can be synthesized from 2.54 l of nitrogen gas and 1.83 l of oxygen gas
2N2 + 5 O2 → 2 N2O5 Because there is more N2 than what would be required to complete the reaction (1.83 x (2/5) = 0.732 liter of N2), O2 is the limiting reactant and N2 is in excess. (2 mol N2O5 / 5 mol O2) x (1.83 L O2) = 0.732 L N2O5
What is the Gay-Lussac equation?Gay Lussac Law Calculation
The results of fresh experiments by French chemist Joseph Louis Gay-Lussac were published in 1808 along with a generalization that has since become known as Gay-law Lussac's of mixing gases. If the gas volume remains constant, the Kelvin temperature is directly proportional to the gas volume. V 1 T 1 = V 2 T 2.
What is a case of Gay-Lussac legislation?The tire pressure of a car increases after driving. This is due to the air inside the tires heating up as a result of friction (a contact force) between the tires and the road. Gay-Law Lussac states that because the air cannot expand because the tires are effectively fixed-volume containers, the pressure rises.
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1. 14.61 g of sodium chloride is dissolved in water to make 500 ml of solution. (show work) a. what is the mass/volume %? b. what is the molarity of this solution?
14.61 g of sodium chloride is dissolved in water to make 500 ml of solution. (show work) a. what is the mass/volume %? b. what is the molarity of this solution? 0.499 (approx)
Mass of sodium chloride, msolute=14.61 g (given)
Volume of solution,v solution=500 ml=0.5 litres (given)
a. Mass/volume % is ratio of mass of solute in grams and volume of solution in ml multiplied from 100%
Mass/volume%=(msolute/vsolution)*100%
=(14.61/500)*100%
Mass/volume%=2.928%
b. Mass of sodium is 23 and chlorine is 35.5
Molecular mass of sodium chloride ie NaCl=23*1+35.5*1=58.5
Number of moles of NaCl is found by dividing mass of NaCl in grams by molecular mass of NaCl,
Number of moles of NaCl,nsolute=14.61/58.5
Molarity of the solution is found by dividing number of moles of solute ie sodium chloride (NaCl) from volume of solution in litres,
Thus,
Molarity of solution=nsolute/vsolution
=(14.61/58.5) / 0.5
=0.499 (approx)
Sodium chloride is used as an electrolyte replenisher to assist save you warmth cramps as a result of an excessive amount of sweating. This medicinal drug is likewise used for the coaching of normal isotonic answer of sodium chloride. This medicinal drug is to be had without prescription.
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when an alkene is subjected to treatment with hg(oac)2 in ch3oh followed by reaction with nabh4, what new class of compound is formed?
An alcohol is created when an alkene undergoes treatment with hg(oac)2 in ch3oh, followed by a reaction with nabh4.
What are the uses of alkene?One of the most adaptable chemical building blocks, alkenes are essential to numerous synthetic reactions. Alkene reactants are used in hydro functionalization processes such olefin hydroalkoxylation and hydroamination, which is a very active area of catalysis.
Alkene vs. alkane: what are they?Alkanes are saturated hydrocarbons because they only have one bond between the carbon atoms. Alkenes have at least one double bond between carbon atoms. Alkynes have one or more triple bonds between carbon atoms. Unsaturated hydrocarbons are the name given to alkenes and alkynes.
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salicylic acid was your limiting reagent, and it has a molecular weight of 138.12g/mol. aspirin, your product, has a molecular weight of 180.15 g/mol. what was your percent yield?
Your limiting agent, salicylic acid, has a molar mass of 138.12 g/mol. Your product, aspirin, does have an molecular weight average of 180.15 g/mol. Methyl salicylate volume = 0.259 mL
What alters the skin does salicylic acid?Salicylic acid applied topically heals acne by bringing down redness and swelling and clearing clogged skin pores to encourage pimples to contract. By softer and looserning dry, scaly, or thicker skin so that it slips off or is removed easily, it addresses other skin disorders.
Briefing
mass = number of moles * molar mass
molecular weight of methyl salicylate is 152.1 g/mol
number of moles = 2 mmol = 0.002 moles
mass = 0.002 moles * 152.1 g/mol
mass of methyl salicylate = 0.3042 g
Volume is determined from the density and mass
Volume = mass/density
volume of methyl salicylate = 0.3042 g/ 1.174 g/ml
volume of methyl salicylate = 0.259 mL
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Equilibrium calculations: Using the equation below for calculating the equilibrium constant for the reaction of PCl3 + Cl2 to produce PCs, make the following substitutions for the reactants and products, and recalculate the equilibrium constant, then comment on the equilibrium constant does it favor products, or reactants? [PCI) = 5.0 mol/L [Cl2] = 5.0 mol/L [PC1s] = 0.1 mol/L [PCI ] 0.050 mol/L K= 9.6 x 10-4 [PC13 ][CI] (7.2 mol/L) (7.2 mol/L) For the steam reformation reaction CH + H2O + CO + 3 H2, calculate the equilibrium constant using the formula and concentrations below, and comment on the equilibrium constant: does it favor products, or reactants? What do you think is the industrial use of this chemical reaction?
The equilibrium constant is 12.5.
The equilibrium constant of a chemical response is the price of its response quotient at chemical equilibrium, a kingdom approached by means of a dynamic chemical device after enough time has elapsed at which its composition has no measurable tendency towards in addition trade.
The equilibrium consistent of a chemical response is the price of its response quotient at chemical equilibrium, a kingdom approached by a dynamic chemical device after enough time has elapsed at which its composition has no measurable tendency in the direction of further trade.
Calculation:-
CH₄ + H₂O ---------> CO + 2H₂
[CO] = 10⁻² mol/L
= 0.01 mol/l
[H₂] = 5 × 10⁻¹ mol/l = 0.5 mol/l
[H₂O] = 10⁻² mol/l = 0.01 mol/l
[CH₄] = 10⁻² mol/l = 0.01 mol/l
K = [CO][H₂]³/[CH₄][H₂O]
= (0.01) × (0.5)³/(0.01)×(0.01)
Kc = 12.5
Equillibirium constant = 12.5
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what is oxidation? what is reduction? what are the oxidation states of cu and zn (both species) in the following reaction: cu2 (aq) zn(s) → cu(s) zn2 (aq) what is oxidized? what is reduced?
Oxidation: Oxidation is the loss of electrons during a reaction by a molecule, atom or ion.
Oxidation occurs when the oxidation state of a molecule, atom or ion is increased. The opposite process is called reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.
Reduction: Reduction involves a half-reaction in which a chemical species decreases its oxidation number, usually by gaining electrons. The other half of the reaction involves oxidation, in which electrons are lost. Together, reduction and oxidation form redox reactions (reduction-oxidation = redox). Reduction may be considered the opposite process of oxidation.
Cu(aq) + Zn(s) = Cu (s) + Zn2+ ( aq)
(2+) (0) ( 0) (2+)
In this reaction, Zn is oxidised and Cu is reduced.
What do you mean by redox reaction?
Redox reactions are oxidation-reduction chemical reactions in which the reactants undergo a change in their oxidation states. The term ‘redox’ is a short form of reduction-oxidation. All the redox reactions can be broken down into two different processes – a reduction process and an oxidation process.
The oxidation and reduction reactions always occur simultaneously in redox or Oxidation-Reduction reactions. The substance getting reduced in a chemical reaction is known as the oxidizing agent, while a substance that is getting oxidized is known as the reducing agent.
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which material has carbon atoms interspersed with iron atoms in its molecular structure? responses steel steel malachite malachite hematite hematite bauxite
The carbon atoms interspersed with iron atoms in its molecular structure has steel.
The carbon atom have the chemical symbol of C. the atomic number of the carbon is 6. the electronic configuration of the carbon atom is 1s² 2s² 2p². the iron atom has the chemical symbol of Fe. the iron atom having the atomic number 26. the electronic configuration is [Ar] 3d⁶ 4s².
The steel is an alloy which is made up of the iron with the added carbon to it .the carbon improve its strength compared to the irons. steel is the alloy which is made up of the iron and the carbon.
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for molecules with only one central atom, how many pairs isolated in the central atom guarantee molecular polarity?
for molecules with only one central atom, only one pair isolated in the central atom guarantee for molecular polarity.
what is molecular polarity?When a molecule, which can be made up of multiple covalent bonds, has a net polarity, one end has a higher concentration of negative charge and the other end has an excess of positive charge, this is referred to as molecular polarity.
What are the types of molecular polarity?The projected degree of polarity in the bond and, subsequently, the type of connection, are generally indicated by the absolute value of the difference in electronegativity (EN) between two linked atoms. A covalent, nonpolar bond develops when the difference is extremely small or nonexistent. When the bond is large, it is either ionic or polar covalent.
What increases molecular polarity?An rising differential in electronegativity is accompanied by an increase in bond polarity and ionic character. The electrons in compounds with polar covalent bonds are distributed unevenly among the bound atoms. The respective electronegativities of the bound atoms have a significant role in determining the polarity of such a connection.
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a 25.0 ml sample of h2so4 requires 20.0 ml of 2.00 m koh for complete neutralization. what is the molarity of the acid? h2so4 2koh → k2so4 2h2o
The molarity of the acid is 0.1M.
At the equivalence point, the addition is terminated.An exact equivalent amount of titrant has been added to the sample at the equivalence point of a titration. The end point is the experimental point at which a signal indicating the end of the reaction appears. A change in an indicator's color or an alteration in an electrical property that is detected during the titration can serve as this signal. The titration error, which is the difference between the end point and the equivalence point, is minimized by carefully selecting an end-point signal and a technique for detecting it.M=n/c
=2/20
=0.1M
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7.93 mol of c5h12 reacts with excess o2, how many moles of co2 will be produced by the following combustion reaction?
The following combustion of fuel will result in the production of 39.65 moles, claims the statement.
What is a mole, exactly?A mole is 6.02214076 x 1023 of any chemical unit, including atoms, molecules, ions, and others. Due to the high number of electrons, molecules, or other components that make up any substance, the mole is a useful measure to utilize. The mole was initially defined as the quantity of atoms contained in 12 grams of co2, but the General Assembly on Measurement and Weights declared in 2018 that the mole will only contain 6.02214076 1023 of some scientific unit as of May 20, 2019.
Briefing:C₅H₁₂+8O₂→6H₂O+5CO₂
From the equation, we see that 1 mole of C₅H₁₂ reacts with excess of O₂ to produce 5 moles of CO₂.
So, 7.93 moles of C₅H₁₂ will react with excess O₂ to produce (7.93*5) moles = 39.65 moles.
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the electronegativity value for mg is 1.2 and the value for o is 3.5. based on these values, what type of bond is expected for a compound formed between mg and o?
The electronegativity value for mg is 1.2 and the value for O is 3.5 based on these value ionic bond is expected to be formed between mg and o.
It is crucial to understand in this type of investigation that the higher the electronegativity value, the more likely it is that an ionic connection will form between the two elements.
Therefore, to demonstrate that an ionic bond should form between two elements, we need to know the difference in their electronegativity values. This query demonstrates that the electronegativity difference is rather substantial. As a result of this important distinction, it is anticipated that an ionic bond will form. If their strengths are comparable, covalent bonds are possible.
The main interaction in ionic compounds is ionic bonding, a type of chemical bonding that involves the electrostatic attraction between two atoms or ions with sharply different electronegativities.
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2. When offspring inherit all of their DNA from one parent, they
are
Answer:
Fertilization
how would you prepare 5.00 ml of a 0.06 m solution of copper 2 sulfate from a stock solution of 0.50 m copper 2 sulfate
How might you get ready? 5.00 ml of a copper 2 sulfate solution at 0.06 m from mass= 2.926g
Why does the body use sulfate?It fills several biological functions throughout the body and is found in numerous forms. It aids drug, food additive, and toxic metal detoxification and is a crucial part of extracellular matrix proteins. Additionally, it stops blood from clotting when it passes through capillaries.
Briefing
molarity = no.of moles of copper /Volume of Solution in lit
0.235=no of moles sulfate /494.9*10^-3
13.114 *10^-3 moles of copper sulfate
molar mass of copper sulfate =223.15 g/mol
moles= given mass/molar mass=13.11485*10^-3.
13.1148810^-3= mass/223.154
mass= 2.926g
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The chemical properties of atoms, ions, and molecules are related to the arrangement of the _______ within them.
Answer: Protons
Explanation:
Protons is the answer because they are unchanging and cannot move compared to electrons.
which of the following aqueous solutions has the highest boiling point? question 3 options: 0.15 m nacl 0.10 m cacl2 0.15 m ba(no3)2 0.20 m nh3 0.10 m al(no3)3
Among the following given options Ba₂(NO₃)₂ has the highest boiling point.
The boiling point of a solvent increases due the addition of a solute in the solvent and it follows the formula:
ΔT = K × m × i
Where K represents the boiling point increasing constant (Depends of the solute), m is molality = molarity when solvent is water, and i is Van't Hoff factor.
This implies that the compound with the higher m × i will be the solution with the highest boiling point,
a. NaCl has i = 2 (NaCl dissociates in Na⁺ and Cl⁻ ions).
m × i = 0.15 × 2 = 0.3
b. CaCl₂; i = 3. (3 ions).
m × i = 0.10M × 3 = 0.3
c. Ba₂(NO₃)₂ dissolves in 5 ions. i = 5
m × i = 0.15 M × 5 = 0.75
d. NH₃ has i = 4:
m × i = 0.2M × 4 = 0.8
e. Al₂(NO)₃ : i = 5
m × i = 0.10 × 5 = 0.5
Hence, the m × i value of Ba₂(NO₃)₂ is highest so it has the highest melting point.
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Sort the characteristics below into categories based on whether they describe ice giants or gas giants. Items (6 items) (Drag and drop into the appropriate avea below mantle of water. ammonia, and methane ice have a core made of rock or solid have rings mantle of metallic hydrogen atmosphere of mainly hydrogen and helium atmosphere of mainly hydrogen helium, and methane Categories: Gas Giants, ke Giants, both
Gas giants: atmosphere of mainly hydrogen and helium, mantle of metallic hydrogen
KE giants: atmosphere of mainly hydrogen helium, and methane , mantle of water. ammonia, and methane ice, have a core made of rock or solid
both: have rings
Since helium cannot be produced chemically, our supplies come from the extremely slow radioactive alpha decay that takes place in rocks. Helium can be extracted from rocks and natural gas deposits, but it is around 10,000 times more expensive to do so from the air. It may be found in water, soil, and air and provides plants and animals with the essential nitrogen they require. The natural decomposition of manure and dead plants and animals produces the majority of the ammonia that enters the environment. Fertilizer uses account for 80% of total ammonia production.
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Which of the following is the energy of atoms vibrating inside an object?
O A. Radiant
OB. Thermal
O C. Electric
OD. Mechanical
if the anode electrode in a voltaic cell is composed of a metal that participates in the oxidation half-cell reaction, what happens to the electrode?
Where the oxidation reaction occurs is at the anode. Therefore, this is the location where the metal loses electrons. Since it goes from oxidation state 0 to +2 in the reaction above, the anode is the Cu(s). Cathode: The cathode is the site of the reduction reaction.
Oxidation takes place at the anode and reduction at the cathode, as indicated by the mnemonic "Red Cat An Ox." The anode is the negative terminal for the galvanic cell because it is the source of electrons for the current generated by the reaction at the anode.
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the cell wall stores nutrents water and waste in an plant cell
Answer:large central vacuole
Explanation:
a sample of chlorine gas is confined in a 5.0 l container at 328 torr and 37 o c. how many moles of gas are in the sample?
The number of moles of gas in the sample is 0.0862 mol which can be calculated using ideal gas law.
An ideal gas is one that follows all the gas laws at every temperature and pressure condition. A real gas is referred to as a gas that does not act like an ideal gas.
From ideal gas equation, it is stated that
PV=nRT
Here, P represents the pressure of gas, V represents the volume of the gas, T represents the temperature, R is the gas constant and n is the number of moles.
It is given that, Volume of gas is 5.0 L, Pressure is 328 torr and the temperature is 37°C. The number of moles can be calculated as follows:
PV=nRT
328 torr*5.0 L=n*62.364 L Torr/mol/K*(32+273) K
n=328 torr*5.0 L/62.364 L Torr/mol/K*305 K
n=1640/19021.02 mol
n=0.0862 mol
Thus, the moles of gas are 0.0862 mol.
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the enthalpy of neutralization for all strong acid-strong base reactions should be the same within experimental error. will that also be the case for all weak acid-strong base reactions?
No, the enthalpy of neutralization for weak acid-strong base reactions will not be the same as for strong acid-strong base reactions.
This is because weak acids do not react as readily and completely with strong bases as strong acids do, resulting in a lower enthalpy of neutralization. Additionally, the extent of the reaction between a weak acid and a strong base will depend on the relative strengths of the two reactants, as well as the concentrations of the reactants.
Therefore, the enthalpy of neutralization for a weak acid-strong base reaction can vary depending on the specific reaction and the concentrations of the reactants.
Any neutralization reaction between a strong acid and strong alkali actually comes down to the same thing i.e.
H⁺ + OH⁻-------> H₂O,
as all the other ions present are spectator ions and so don't play an active part in the reaction. As the overall reaction is always the same irrespective of the acid or alkali the enthalpy change will also be the same.
If a weak acid is used the enthalpy change will be less exothermic as some of the energy evolved will be canceled out by the energy needed to complete the dissociation of the incompletely dissociated acid during the reaction
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what is the percent ionization of a monoprotic weak acid solution that is 0.181 m? the acid-dissociation (or ionization) constant, ka, of this acid is 2.32×10−11 . percent ionization
The percent ionization of a monoprotic weak acid solution that is 0.181 m the acid-dissociation (or ionization) constant, ka, of this acid is 2.32×10−11 is 1.13x10^-3 T%
The concentration of solution of 0.433 M.
The Ka of the acid is 2.32 x 10~
~and the solution has a concentration of 0.181T M.
We can calculate the hydronium ion concentration by using the equation: |
Ka=[H3O+][A-]/HA-][H3O+]
[H3O+]=[A-]
[H3O+]^2=Ka[HA]
[H3O+]^2= 2.32X10^-11x0.181M[H3O+]=2.049195x10^-6 M
We can then calculate the percent ionization using the equation:
Percent ionisation= [H3O+]/[HA]x100
Percent ionisation= 2.049195x10^-6 M/0.181 M=1.13x10^-3 %
The percent ionization is 1.13x10^-3 %
The percent ionization of a 0.433 M solution of the monoprotic acid is 0.00113%
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The percent ionization of a monoprotic weak acid solution that is 0.181M is 0.001132%
It is given that the concentration of the monoprotic acid is 0.181M and the acid-dissociation (or ionization) constant, ka, of this acid is 2.32×10^−11.To find the percent ionization of a monoprotic weak acid solution, the following steps are to be followed,
[H+] = √Ka x C
On substituting the values of Ka and the concentration of the acid, we get
[H+] = √2.32 x10⁻¹¹ x 0.181
= √0.4199x10⁻¹¹
[H+] = 2.049 x 10⁻⁶M
The dissociation is given by,
AH + H₂O -------> A- + H₃O⁺
[H+] = [A-] = 2.049 x 10⁻⁶M
[HA] at equilibrium is given by
= 0.181-2.049 x 10⁻⁶
=0.180997
The percentage of ionization is given by,
Percentage ionization = [H₃O⁺]/[HA] x 100
On substituting,
Percentage ionization = 2.049 x 10⁻⁶/0.181x100
= 1.132 x 10⁻³%
Percentage ionization = 0.001132%
Therefore the percentage ionization is 0.001132%
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With a pressure of 1.5 atm (atmosphere), a piston pushes in on the gas in a cylinder, compressing it from 5.1 L to 1.8 L. What is the work done on the gas (in joules)?
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the work done on the gas (in joules) is 4.95 J.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat
n = no of moles
ΔH = enthalpy
n = w / M.M
Work in thermodynamic= work done on the system =p×change in temperature
work done on the system= 1.5 atm×(5.1 L - 1.8 L. )
work done on the system=4.95 J
Therefore, the work done on the gas (in joules) is 4.95 J.
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amp-pnp is a non-hydrolyzable analog of atp that can bind to proteins in a similar manner as atp but is no longer hydrolyzed. predict what would happen to helicase activity if amp-pnp were added to a dna replication reaction.
Since the AMP-PNP is not hydrolyzed, the helicase would no longer work. DNA unwinding by helicase is made possible by conformational changes brought on by ATP binding and hydrolysis.
What happens during DNA replication?A double-stranded DNA molecule is copied to create two identical DNA molecules through the process of DNA replication. Because every time a cell divides, the two new daughter cells must have the same genetic material, or DNA, as the parent cell, replication is a crucial process.
What function does a helicase serve?By using the energy-equivalent ATP, DNA helicases are enzymes that can unwind DNA. All species depend on them for DNA recombination, DNA repair, and replication.
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5 g of gold and 25 g of silver are mixed to form a single-phase ideal solid solution. (a) how many moles of solution are there? (b) what are the mole fractions of gold and silver?
The moles of the solution are 0.256 mol. the mole fraction of gold 0.097 and the mole fraction of silver is 0.902.
given that :
mass of gold = 5 g
mass of silver = 25 g
molar mass of gold = 196.9 g/mol
molar mass of silver = 107.8 g/mol
a) moles of gold = mass / molar mass
= 5 / 196.9
= 0.025 mol
moles of silver = mass / molar mass
= 25 / 107.8
= 0.231 mol
total moles of solution = 0.025 + 0.231 = 0.256 mol.
b) mole fraction of silver = 0.231 / 0.256
= 0.902
mole fraction of gold = 0.025 / 0.256
= 0.097
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