The corresponding concentration values of OH⁻ for the pH values
of following are -
1- 10⁻¹
3- 10⁻³
5- 10⁻⁵
7- 10⁻⁷
9- 10⁻⁹
11- 10⁻¹¹
What do you mean by the pH value ?
pH is a logarithmic measure of the hydrogen ion concentration of an aqueous solution pH = -log[H+]
pH describes how acidic or basic an aqueous solution is, where a pH below 7 is acidic and a pH greater than 7 is basic. pH of 7 is considered neutral .
Functions of OH− :
OH− functions as a base .
Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a single covalent bond, and carries a negative electric charge.
Hence, this way pH values of these concentrations are mentioned .
Learn more about pH values ,here:
https://brainly.com/question/1503669
#SPJ1
Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions
book for this test.
Which series of atomic numbers represents the ordering of consecutive elements within the periodic table?
O 1, 2, 3, 4, ...
O 1, 3, 5, 7, ...
O 10, 20, 30, 40, ...
O 2, 4, 8, 16, ...
The sequence of atomic numbers 1, 2, 3, and 4 denotes the periodic table's ordering of following elements.
What purpose do series serve?Series are significant because they offer a possible point of entry. It's possible for a user to merely be aware of the fact that a publication is part of a specific series or to be searching for all publications in that series without being aware of any of the individual titles. The series could potentially be used as a storage and control system.
A series element is what?There are two ways to recognize elements in a series: The elements are in series if there are two and only two connections between them and a single node. When two elements' currents are determined to be similar by KCL at a node, the elements are in series.
To know more about periodic table visit :
https://brainly.com/question/11155928
#SPJ1
1. There are 42 grams of sugar (C12H22O11) in a can of pop (342mL). Use this information (where necessary) to answer the following questions:
a) How many moles of sugar are there in the pop (3 marks)?
b) If a mole of sugar costs 90 cents, what is the value of the sugar in a can of pop (3 marks)?
c) How many particles of sugar are there in the pop (3 marks)?
The number of sugar particles is 7.4 * 10^22 particles.
What is the mole?The mole is used to describe the amount of substance. The idea was first introduced by Professor Avogadro and the number of particles that constitute one mole of a substance was said to be 6.02 * 10^23 particles in a mole.
Thus;
Molar mass of sugar = 342 g/mol
Number of moles of sugar = 42 grams/342 g/mol = 0.123 moles
Now;
If 1 mole of sugar costs 90 cents
0.123 moles of sugar costs 0.123 moles * 90 cents/1 mole
= 11 cents
Now we know that;
1 mole of sugar contains 6.02 * 10^23 particles
0.123 moles of sugar contains 0.123 moles * 6.02 * 10^23 particles / 1 mole
= 7.4 * 10^22 particles
Learn more about moles of sugar:https://brainly.com/question/14434096
#SPJ1
Rutherford gold-foil experiment
In 1909 Rutherford disproved Sir J.J. Thomson's model of the atom as a uniformly distributed substance. Because only very few of the alpha particles in his beam were scattered by large angles after striking the gold foil while most passed completely through, Rutherford knew that the gold atom's mass must be concentrated in a tiny dense nucleus.
Most alpha particles passed straight through the gold foil, which implied that atoms are mostly composed of open space. Some alpha particles were deflected slightly, suggesting interactions with other positively charged particles within the atom. Still other alpha particles were scattered at large angles, while a very few even bounced back toward the source. (Rutherford famously said later, “It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.”) Only a positively charged and relatively heavy target particle, such as the proposed nucleus, could account for such strong repulsion. The negative electrons that balanced electrically the positive nuclear charge were regarded as traveling in circular orbits about the nucleus. The electrostatic force of attraction between electrons and nucleus was likened to the gravitational force of attraction between the revolving planets and the Sun. Most of this planetary atom was open space and offered no resistance to the passage of the alpha particles.
some one please presize this
The Rutherford experiment was used to prove the existence of a positively charged nucleus containing the protons.
What is the Rutherford experiment?The Rutherford experiment was used to prove the existence of a positively charged nucleus..
Alpha particles passed mostly undeflected through a aluminum foil.
The part of the foil where the alpha particles were deflected was the positively charged nucleus where most of the mass of the atom was concentrated.
In conclusion, the Rutherford experiment proved the existence of a positively charged nucleus.
Learn more about Rutherford experiment at: https://brainly.com/question/14996029
#SPJ1
What is the molar mass of a gas if a flask with a volume of 3. 16 l contains 9. 33 grams of the gas at 32. 0°c and 1. 00 atm?
The molar mass of a gas if a flask with a volume of 3. 16 L contains 9. 33 grams of the gas at 32. 0°C and 1. 00 atm is 1.17g/mol
Calculation ,
In this question we have to fist find the number of moles of gas by using ideal gas equation and from the help of number of moles we can determine molar mass.
According to ideal gas equation which is also known as ideal law ,
PV = nRT ...( i )
where P is the pressure of the gas = 1 atm
V is the volume of the gas in the flask with volume = 3. 16 L
R is the universal gas constant = 0.082 atm L/K mol
T is the temperature = 32. 0°C = 32 + 273 = 305 K
n is the number of moles = ?
Putting the value of Pressure P , volume V , temperature T , number of moles n and universal gas constant R in the equation (i) we get ,
1 atm ×3. 16 L = n× 0.082 atm L/K mol ×305 K
n = 1 atm ×3. 16 L / 0.082 atm L/K mol × 305 K = 0.126 mole
number of mole of a gas = 0.126 mole = given mass/ molar mass
molar mass = number of moles × Given mass = 0.126 × 9. 33 = 1.17g/mol
Learn about flask
https://brainly.com/question/14161066
#SPJ4
A 0. 150 amp current is run through a solution of ni2 ions for 12. 2 hours. what mass of metal is deposited on the cathode?
The mass of nickel metal deposited on the cathode is 2.004 g.
What is electrolysis?When an ionic compound is decomposed into its elements by passing a direct electric current using a compound in its liquid form. The process is known as electrolysis.
At the cathode, cations are reduced and at the anode, anions are oxidized.
The main components used in the process of electrolysis are
electrolyte, electrodes,external power sourceCurrent passed through the solution, I = 0.150 A
Time, t = 12.2 hrs = 12.2×60×60 = 43920 sec
Charge, q = It = 0.150 × 43920 = 6588 C
At cathode,
[tex]Ni^{2+}(aq) + 2e^- \rightarrow Ni(s)[/tex]
Nickel metal deposited by (2×96487 C) = 58.7g
Nickel metal deposited by 6588 C = [tex]\frac{58.7 \times 6588 }{2\times96487}[/tex] = 2.004 g
Hence, The mass of nickel metal deposited on the cathode is 2.004 g.
Learn more about electrolysis:
https://brainly.com/question/25712870
#SPJ4
During the nitrogen cycle, inorganic nitrogen from the atmosphere is converted into organic compounds. what is this process called? nitrogen cycle is illustrated with a missing step pointing from nitrogen (the atmosphere) to the roots of a plant. © 2016 cc-by-sa decomposition emission fixation transpiration
Nitrogen fixation -
The N2 must be changed through a procedure known as nitrogen fixation for it to be utilized by plants. Fixation transforms atmospheric nitrogen into forms that plants' root systems can absorb.What is the organic form of nitrogen?
Nitrate, nitrite, ammonium, and N2 gas are the main inorganic nitrogen forms. Numerous compounds, such as amino acids, proteins, nucleic acids, nucleotides, and urea, contain organic nitrogen.Learn more about Nitrogen fixation
brainly.com/question/19938608
#SPJ4
A mixture of three gases, A, B and C, is at a total pressure of 6.11 atm. The partial
pressure of gas A is 1.68 atm; that of gas B; is 3.89 atm. What is the partial pressure
of gas C?
2.13 atm
2.21 atm
5.57 atm
0.54 atm
The partial pressure of gas C is 0.54atm. The correct option is D.
What is partial pressure?The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.
The total pressure of A, B and C is 6.11 atm.
The partial pressure of A is 1.68 atm
The partial pressure of B is 3.89 atm.
Total pressure = sum of partial pressures of all the gasses in that mixture
6.11atm = 1.68atm + 3.89atm + Pc
Pc = 6.11atm - (1.68 + 3.89) = 0.54atm
Thus, the partial pressure of C is 0.54atm. The correct option is D.
To learn more about partial pressure, refer to the link:
https://brainly.com/question/13199169
#SPJ1
The condition of acidosis can cause ____________ because the higher h concentration diffuses to the icf, pushing k towards the ecf
Acidosis is a disorder in which there is excess acid in the body. This condition can lead to hyperkalemia due to the diffusion of hydrogen ions in the intracellular fluid.
What is hyperkalemia?Hyperkalemia is an increased concentration of the fluid potassium level than normal. Though potassium (K) is needed by the body for various functions of the nervous system and muscles their excess can lead to diseases.
It can also be caused by acidosis, where the concentration of the hydrogen ion increases in the intracellular fluid which leads to a large movement of potassium ions toward the extracellular fluid.
Therefore, the condition of acidosis can cause hyperkalemia.
Learn more about hyperkalemia here:
https://brainly.com/question/8920601
#SPJ4
My science exam is due tomorrow and I HAVE LIMITED TIME. can someone help me how to absorb anything you read and memorize it...
Answer:
It won't let me type this for some reason but here it is.
8.0 liters I2 forms at STP. How many moles of KI were required for the reaction?
Answer:
0.71 moles KI
Explanation:
At STP, there should be 1.0 moles at 22.4 L. However, there are only 8.0 L of I₂. Therefore, we must set up a proportion to find the correct moles of I₂.
[tex]\frac{1 mole}{22.4 L} =\frac{? moles}{8.0 L}[/tex] <----- Proportion
[tex]8.0 = 22.4(? moles)[/tex] <----- Cross multiply
[tex]0.36 = ? moles[/tex] <----- Divide both sides by 22.4
To find the moles of KI, you can use the mole-to-mole ratio from the balanced equation coefficients. The final answer should have 2 sig figs.
2 KI(aq) + Cl₂(g) ---> 2KCl(aq) + 1 I₂(g)
^ ^
0.36 moles I₂ 2 moles KI
---------------------- x -------------------- = 0.71 moles KI
1 mole I₂
Answer: 0.71 moles KI
Explanation:
The condensation of water vapor in the atmosphere and subsequent transfer to the ocean via precipitation is an example of a(n)?
The condensation of water vapor in the atmosphere and subsequent transfer to the ocean via precipitation is an example of a Water Cycle.
What is Water Cycle ?Water cycle is also called hydrologic cycle that shows the continuous movement of water between the air and land.
What are the stages in Water Cycle ?There are four main stages in the water cycle:
Evaporation Condensation Precipitation CollectionThus from the above conclusion we can say that The condensation of water vapor in the atmosphere and subsequent transfer to the ocean via precipitation is an example of a Water Cycle.
Learn more about the Water Cycle here: https://brainly.com/question/25796102
#SPJ4
Liquid acetaminophen for children is labeled 180 mg 3 ml. what is the strength expressed as grams per ml?
Liquid acetaminophen for children is labeled 180 mg 3 ml. The strength expressed as grams per ml is 0.060.
What is acetaminophen?
Acetaminophen is a medicine that is used to treat all kind of pains. Headache, menstrual pain, stomach ache, etc. It also used to reduce fever and cold/cough.
Liquid acetaminophen for children is labeled as 180 mg/ 3ml
The 180 mg will be divided by 3 ml
180 mg/ 3ml = 60 mg/ml
The amount will be multiplied by 1 /1000 to get the quantity equal.
60 mg/ml x 1g / 1000 g
60 x 1/ 1000 mg/ml = 0.060
Thus, the strength expressed as grams per ml is 0.060.
To learn more about acetaminophen, refer to the link:
https://brainly.com/question/1869865
#SPJ4
find total atoms present in 0.1 mol of H2so4 show your calculations or u will be reported
Answer:
1 mole of H2SO4 contains 2 x 6.023 x 10²³ So, 0.1 mole of H2SO4 contains =2 x 6.023 x 10²³ x 0.1
= 1.2 x 10²³atoms of hydrogen
hello there !!
In the Question it's asked that total atoms present in 0.1 mol of H2So4.
so , in the question number of moles is given as 0.1 mole
=> n = 0.1 mole
and total atoms present are = ???
So , in H2So4 molecule there are two hydrogen atoms
=> H2So4 → 2 hydrogen atoms
one mole of H2So4 consist of ;
=> 2 × 6.022 × 10²³
1 mol = 6.022 × 10 ²³ atoms
Therefore, 0.1 mole of H2So4
=> 0.1 × 2 × 6.022 × 10²³ Atoms
=> 0.1 × 2 × 6.022 × 10²³ Atoms=> 12.004 × 10²² Atoms
What volume (ml) of fluorine gas is required to react with 1. 28 g of calcium bromide to form calcium fluoride and bromine gas at stp?
144 mL of fluorine gas is required to react with 1.28 g of calcium bromide to form calcium fluoride and bromine gas at STP.
What is Ideal Gas Law ?The ideal gas law states that the pressure of gas is directly proportional to the volume and temperature of the gas.
PV = nRT
where,
P = Presure
V = Volume in liters
n = number of moles of gas
R = Ideal gas constant
T = temperature in Kelvin
Here,
P = 1 atm [At STP]
R = 0.0821 atm.L/mol.K
T = 273 K [At STP]
Now first find the number of moles
F₂ + CaBr₂ → CaF₂ + Br₂
Here 1 mole of F₂ reacts with 1 mole of CaBr₂.
So, 199.89 g CaBr₂ reacts with = 1 mole of F₂
1.28 g of CaBr₂ will react with = n mole of F₂
[tex]n = \frac{1.28\g \times 1\ \text{mole}}{199.89\ g}[/tex]
n = 0.0064 mole
Now put the value in above equation we get
PV = nRT
1 atm × V = 0.0064 × 0.0821 atm.L/mol.K × 273 K
V = 0.1434 L
V ≈ 144 mL
Thus from the above conclusion we can say that 144 mL of fluorine gas is required to react with 1.28 g of calcium bromide to form calcium fluoride and bromine gas at STP.
Learn more about the Ideal Gas here: https://brainly.com/question/20348074
#SPJ4
Draw the major product formed in the reaction involving an acid anhydride dissolved in alcohol.
Learn more about acid anhydride here:
https://brainly.com/question/3678985
#SPJ4
I’ll mark u brainliest!!
Why are salt and sugar both able to dissolve in water, even though the solutes have different types of chemical bonding?.
The polar water molecules attract the oppositely assessed polar areas of the sucrose molecules and pull them away, resulting in dissolving. Since the ions in salt and the molecules in sugar are very different, their solubilities tend to be additional.
What is chemical bond?A chemical bond is a continuing attraction between atoms, ions, or molecules that promotes the formation of chemical mixtures. The bond may result from the electrostatic significance between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.A chemical bond is what holds atoms concurrently in molecules. Bonds arise from the electrostatic energies between positively charged atomic nuclei and negatively charged electrons (the functions of which in space are determined by quantum mechanics).A chemical bond is a point of attraction between atoms or ions. Bonds form when atoms share or transmit valence electrons. Valence electrons are the electrons in the outer significance level of an atom that may be interested in chemical relations. Valence electrons are the basis of all chemical bonds.To learn more about chemical bond, refer to:
https://brainly.com/question/819068
#SPJ4
Identify the reactants and the products in this chemical equation. 2fe2o3 3c → 4fe 3co2
Answer:
Reactants: Fe₂O₃ and C
Products: Fe and CO₂
Explanation:
The reactants are the molecules that undergo changes in a reaction.
The products are the molecules which are made during a reaction.
The reactants are on the left side of the arrow and the products are on the right side of the arrow. Therefore.....
The chemical reaction:
2 Fe₂O₃ + 3 C -----> 4 Fe + 3 CO₃
Reactants: Fe₂O₃ and C
Products: Fe and CO₂
A doubly charged ion with velocity 6. 9 × 106 m/s moves in a path of radius 30 cm in a magnetic field of 0. 80 t in a mass spectrometer. what is the mass of this ion?
The mass of this ion is 1.16*10^-26kg.
To find the answer, we have to know about the force acting on a particle circulating in a uniform magnetic field.
How to find the mass of this ion?Let us consider that, a particle of mass m with charge q moving with velocity v in a circular orbit of radius r, then the centripetal force of it's path will be equal to the Lorentz magnetic force.[tex]F_c=F_B\\\frac{mv^2}{r} =qvB\\[/tex]
Thus, the mass of the doubly charged ion will be,[tex]m=\frac{qBr}{v} =\frac{2*1.67*10^{-19}*0.8*30*10^{-2}}{6.9*10^6} \\m=1.16*10^{-26}kg[/tex]
Thus, we can conclude that, the mass of this ion is 1.16*10^-26kg.
Learn more about the force here:
https://brainly.com/question/11701736
#SPJ4
What was the oxygen consumption for a burmese python at 20 contractions per minute?
The oxygen consumption for a burmese python at 20 contractions per minute 5,30,35,10,15,20,25 contractions per minute.
PythonThe Eastern Hemisphere's tropical and subtropical regions are home to the genus Python, a family of constricting snakes. For non-venomous flecked snakes, François Marie Daudin suggested the name "Python" in 1803. There are now 10 recognized python species. A new species has been established, and three previously recognized python subspecies have been elevated.
Ythons lack venom, and colubrids (rear-fanged snakes) either lack venom entirely or have a weak venom. It is important to take venomous elapid (front-fanged snake) bites seriously and treat them accordingly. Massive snakes called pythons have a brutal killing style. These snakes, like other strong constrictors like anacondas, will capture their victims with their mouths and wrap around them.
What was the oxygen consumption for a burmese python at 20 contractions per minute?
Learn more about Python here:
https://brainly.com/question/15083944
#SPJ4
What concentration of the barium ion, ba2 , must be exceeded to precipitate baf2 from a solution that is 1. 00×10−2 m in the fluoride ion, f−? ksp for barium fluoride is 2. 45×10−5
The amount of barium ions that must be present in order for the salt to precipitate is 0.245 M.
A solution's solubility product is the result of raising each ion's concentration to the power of its stoichiometric ratio. It is portrayed as
A combination of 1 barium ion and 2 fluoride ions results in the ionic compound known as barium fluoride.
The following equation describes the equilibrium reaction for barium fluoride ionization:
BaF₂ → Ba²⁺ + 2F⁻
Ksp = [Ba²⁺] · [F⁻]²
2.45*[tex]10^{-5}[/tex]= [Ba²⁺] * [tex][1. 00*10^{-2} ]^{2}[/tex]
[Ba²⁺]=0.245 M
As a result, 0.245 M of barium ions must be present in order for the salt to precipitate.
SolubilitySolubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. Inability of the solute to create such a solution is the opposite quality, or insolubility. A substance's degree of solubility in a given solvent is often determined by the amount of the solute present in a saturated solution, which is a solution in which no additional solute can be dissolved. The solubility equilibrium between the two compounds is considered to have been reached at this time. If there is no such restriction for a given solute and solvent, the two are referred to as being "miscible in any amounts."
What concentration of the barium ion, ba2 , must be exceeded to precipitate baf2 from a solution that is 1. 00×10−2 m in the fluoride ion, f−? ksp for barium fluoride is 2. 45×10−5
Learn more about solubility here:
https://brainly.com/question/8591226
#SPJ4
Consider the reaction in the lead-acid cell pb(s) pbo2(s) 2 h2so4(aq) 2 pbso4(aq) 2 h2o(l) for which e°cell = 2. 04 v at 298 k. δg° for this reaction is:________
δg° for the reaction having e° cell = 2.04v. is 393.658kJ.
The lead (Pb) in the lead storage battery act as an anode
What is Voltaic Cell?A voltaic cell or galvanic cell is an electrochemical cell that uses chemical reactions to produce electrical energy.
Parts of voltaic cellAnode where oxidation occurs Cathode where reduction occurs.
Therefore, Pb acts as anode and PbO2 act as a cathode.
Given,
E° cell = 2.04v
Faraday constant= 96485 C/mol
Moles of electron transferred n= 2
∆G = -nFE°
= -2 × 96485 × 2.04
= 393.658kJ
Thus we concluded that the δg° for the reaction having e° cell = 2.04v. is 393.658kJ.
learn more about voltaic cell :
https://brainly.com/question/1370699
#SPJ4
Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm^3. What is the radius of a platinum atom?
Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm^3. The radius of the platinum atom is 139pm.
The radius of the platinum atom can be found by the relation of density and radius of atom.
Platinum has a face-centered cubic (fcc) crystal structure which means that 4 atoms are present in each structure.
Hence no. of atoms, Z=4
The radius of atom can be found out by substitution in the below formula:
Relation of density and radius of atom:
Density, d = Z × M / Nₐ × a³
∴ where, Z is the no. of atoms = 4
M is the Molecular mass of platinum = 195 g/mol
N is the Avogadro's number = 6 × 10²³ / mol
a is the radius of the atom = ?
d is the density = 21.5 g/cm³
⇒ a³ = Z × M / Nₐ × d
⇒ a³ = 4 × 195 / 6 × 10²³ × 21.5
⇒ a = 139 × 10⁻¹²m
a = 139pm
Hence, the radius of the platinum atom is 139pm.
Learn more about FCC here, https://brainly.com/question/21327238
#SPJ4
The answer is 139pm
The relationship between density and radius of an atom may be used to calculate the radius of a platinum atom.
Platinum has a face-centred cubic (fcc) crystal structure, which implies that each structure has four atoms.
As a result, the number of atoms is Z=4.
Substitution in the following formula yields the radius of an atom:
Atomic density and radius relationship:
Density,[tex]$d=Z \times M / N_{a} \times a^{3}$[/tex]
[tex]$\therefore$[/tex] where, Z is the no. of atoms =4
[tex]$\mathrm{M}$[/tex] is the Molecular mass of platinum [tex]$=195 \mathrm{~g} / \mathrm{mol}$[/tex]
[tex]$\mathrm{N}$[/tex]is the Avogadro's number [tex]$=6 \times 10^{23} / \mathrm{mol}$[/tex]
a is the radius of the atom = ?
[tex]$\mathrm{d}$[/tex] is the density [tex]$=21.5 \mathrm{~g} / \mathrm{cm}^{3}$[/tex]
[tex]$$\begin{aligned}&\Rightarrow a^{3}=Z \times M / N_{a} \times d \\&\Rightarrow a^{3}=4 \times 195 / 6 \times 10^{23} \times 21.5 \\&\Rightarrow a=139 \times 10^{-12} m \\&a=139 p m\end{aligned}$$[/tex]
What is platinum atom?
Platinum is a periodic table element with the atomic number 78 and the atomic mass 195. It is a very uncommon element found in the earth's crust. Because of its grey-white silvery color, the name platinum is derived from Platina (Spanish for "small silver").To learn more about platinum atom visit:
https://brainly.com/question/2860249?
#SPJ4
what is the freezing point, in C, of a 2.75 m solution of C8H18 in benzene?
The freezing point of benzene is 14.08°C.
What is freezing point?The temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure.
Calculation
The equation which give relation between freezing point depletion and molality is,
[tex]\Delta T_{f} = K_{f} \times m[/tex]
where,
[tex]\Delta T_{f}[/tex] = change in the freezing point of the solvent.
[tex]K_{f}[/tex] of benzene = 5.12°C/m (given)
M is molality of the solution = 2.75 M
Now, after putting the value in above formula we get
[tex]\Delta T_{f} = K_{f} \times m[/tex]
[tex]\Delta T_{f} = 5.12 \times 2.75[/tex]
= 14.08°C
Thus from the above conclusion we can say that The freezing point of benzene is 14.08°C.
To learn about freezing point :https://brainly.com/question/3121416
#SPJ1
Answer:
-8.58
Okay, im having trouble with the question too and the answer i types was wrong, so i went to omnicalculator instead and got this answer which was right. :')
What mass of kcl in grams must be added to 500 ml of a 0. 15 m kcl solution to produce a 0. 40 m solution.
91.4 grams mass of KCl is required.
Concentration = moles/Volume
2.45M=mol/0.5L
2.45M⋅0.5L=mol
mol=1.225
Convert no. of moles to grams using the atomic mass of K + Cl
1.225mol⋅(39.1+35.5)/gmol
1.225mol⋅74.6g
mol=1.225⋅74.6g = 91.4g
What is Concentration?The formula for determining concentration from moles and volume is pretty straightforward. Simply divide the volume of solution by the moles of solute.The number of moles of a component divided by the sum of the moles in the solution is what is known as a mole fraction, which is a unit of concentration. Mole fraction is a unit-free expression because it represents a ratio.To learn more about concentrations, refer to the given link:
https://brainly.com/question/23312431
#SPJ4
How many half-lives have passed in a sample that originally contained 5000 parent isotopes but now has only 625?
Answer:
3 half lives
Explanation:
5000 * (1/2)^n = 625 where n = number of half lives
log ( 625/5000) / log(1/2) = n = 3
5000 2500 1250 625
Calculate the number of molecules present in 3.4 moles of Ammonia (NH3) [At No. N=7, H=1]
The 3.4 moles of Ammonia (NH₃) have 2.0475 x 10²⁴ molecules of it.
What is a Mole?A mole is a unit used to count the elementary particles such as atoms, molecules, or ions of a substance.1 mole has a fixed value that is 6.022 x 10²³ of something and is known as Avogadro’s number. Avogadro’s number is represented by [tex]N_A[/tex]For example, a mole of hydrogen atom means 6.022 x 10²³ atoms of hydrogen and one mole of hydrogen molecule (H₂) is equal to 6.022 x 10²³ molecules of hydrogen which also means 2 x 6.022 x 10²³ atoms of hydrogen.How to calculate the number of molecules of an atom?We know,
The number of moles is given by
[tex]n =\frac{m}{M}[/tex]
The number of molecules is the product of a number of moles and Avogadro's number[tex]N_A[/tex]
Number of molecules of NH₃ = [tex]n \times N_A[/tex]
= 3.4 x 6.022 x 10²³
= 2.0475 x 10²⁴ molecules
Hence, 3.4 moles of Ammonia have 2.0475 x 10²⁴ molecules
Learn more about mole:
https://brainly.com/question/26416088?referrer=searchResults
#SPJ1
2C6H6(g) + 15O2(g) = 12CO2(g) + 6H2O(g)
2.0 moles C6H6 reacts with oxygen according to the reaction above. What volume of water vapor forms at STP?
At STP, the volume of water that is produced is 134.4 L.
What is the volume?Now we know that the equation of the reaction is;
2C6H6(g) + 15O2(g) = 12CO2(g) + 6H2O(g)
We can use the stoichiometry of the reaction to determine the volume of the water produced as follows;
2 mole of C6H6 produced 6 moles of water. If 1 mole of water occupies 22.4 L then 6 moles of water will occupy 6 * 22.4 L = 134.4 L
Thus, we can see that at STP, the volume of water that is produced is 134.4 L.
Learn more about stoichiometry:https://brainly.com/question/9743981
#SPJ1
If a buffer is composed of 34. 63 ml of 0. 139 m acetic acid and 36. 50 ml of 0. 182 m sodium acetate, how many ml of 0. 100 m hcl can be added before the buffer capacity is reached?
The volume is the product of the molar concentration and the moles of the substance. The volume of hydrochloric acid that can be added to the buffer is 0.066 L.
What is a buffer?A buffer is a constant solution with a proton or hydrogen ion concentration with an acid, base, or salt dissolved in them.
The chemical reaction between hydrochloric acid and sodium acetate is given as,
HCl + CH₃Coo-Na → CH₃CooH + NaCl
From above the initials moles of acetic acid are given as,
Moles = molarity × volume
= 0.139 M × 0.0346 L
= 0.0048 moles
The initials moles of sodium acetate are given as,
M = 0.182 M × 0.0365 L
= 0.0066 moles
As it is known that the ratio of the buffer capacity is 10 for sodium acetate and acetic acid so,
Moles sodium acetate ÷ Moles Acetic acid = 10
(0.0066 moles + X) ÷ (0.0048 moles - X) = 10
Here, X is the moles of HCl and is calculated as,
0.0066 moles + X = 0.048 moles - 10X
11 X = 0.048 ÷ 0.0066
11 X = 7.27
X = 0.66 moles
The volume of 0.100 HCl with 0.66 moles is:
Volume = moles × molarity
= 0.100 × 0.66
= 0.066 L
Therefore, 0.066 L of 0.100 M HCl is required to reach the buffer capacity.
Learn more about buffer here:
https://brainly.com/question/24262133
#SPJ4
Which reaction most accurately represents the dissociation of nitrous acid (hno2) in water?
When nitrous acid (HNO₂) dissociates in water (H₂O), the reaction that best captures this process is:
HNO₂ (aq.) + H₂O ↔ H₃O⁺ (aq.) + NO₂⁻ (aq.)
How does one know about HNO₂?
The chemical designation for nitrous acid is HNO₂, and it is a monoprotic acid. Three elements—hydrogen(H), oxygen(O), and nitrogen(N), all compose it. It is highly fragile in nature and only occurs in solutions. It is employed to convert amines into diazonium salts.Is HNO₂ a basic or an acid?
Acidity is assigned to nitrous acid (HNO₂). Once dissolved in water, it gives out H+ ions. Acid is a chemical that produces H+ ions in a water-based solution or gives the protons to other molecules.
Thus, HNO₂ is acid because it causes a mixture of water to contain H+ ions. In a 10 mM concentration, it possesses a pH of 2.67.
Learn more about nitrous acid here:
https://brainly.com/question/17055219
#SPJ4
