Answer:
[tex]\boxed {\boxed {\sf 0.495 \ mol}}[/tex]
Explanation:
We are given a number of particles and asked to convert to moles.
1. Convert Particles to Moles1 mole of any substance contains the same number of particles (atoms, molecules, formula units) : 6.022 *10²³ or Avogadro's Number. For this question, the particles are not specified.
So, we know that 1 mole of this substance contains 6.022 *10²³ particles. Let's set up a ratio.
[tex]\frac { 1 \ mol }{6.022*10^{23 } \ particles}}[/tex]
We are converting 2.98*10²³ particles to moles, so we multiply the ratio by that value.
[tex]2.98*10^{23} \ particles *\frac { 1 \ mol }{6.022*10^{23 } \ particles}}[/tex]
The units of particles cancel.
[tex]2.98*10^{23} *\frac { 1 \ mol }{6.022*10^{23 } }}[/tex]
[tex]\frac { 2.98*10^{23}}{6.022*10^{23 } }} \ mol[/tex]
[tex]0.4948522086 \ mol[/tex]
2. RoundThe original measurement of particles (2.98*10²³) has 3 significant figures, so our answer must have the same.
For the number we found, 3 sig figs is the thousandth place.
The 8 in the ten-thousandth place (0.4948522086) tells us to round the 4 up to a 5 in the thousandth place.
[tex]0.495 \ mol[/tex]
2.98*10²³ particles are equal to approximately 0.495 moles.
Practice by predicting what would happen if the following underwent alpha decay: (2 points each)
i. Radium-226 ________+ _____
ii. Plutonuim-240 __________+ _____
iii. Uranium-238 __________+ _____
Answer:
See explanation and image attached
Explanation:
During alpha decay, the mass number of the daughter nucleus is less than that of the parent nucleus by 4 units while the atomic number of the daughter nucleus is less than that of the parent nucleus by two units.
Hence, the daughter nucleus is found two places before the parent in the periodic table.
The alpha decay of the species shown in the question are described in the image attached to this answer.
HELP PLEASE!!!!!
Can someone please help me I should submit it today and the answer should be as paragraph
Answer:
National fire protection Association
Explanation:
the nfpa is a global self funded nonprofit orgnazation establised in 1896 devoted to eliminating death injury protery loss and ecomomic loss due to fire and electrical hazards
Write the reaction of maleic acid with Br2
what is the relationship between Celsius scale and Kelvin scale of temperature ? very sort answer
Answer:
Celsius + 273 = Kelvin
Explanation:
g An ionic bond involves ____ a. molecules that gain or lose an atom to develop a bonding charge b. molecules that bond together through a weak force c. atoms that either lose or gain an electron in order to bond d. atoms that share an electron to tightly bond
Answer:
a. molecules that gain or lose an atom to develop a bonding charge
Explanation:
what is the correct symbol for the element copper
Answer:
the correct symbol for copper is:CUAnswer:Cu
Explanation
First letter is usually capital then the other letters are usually in small letters
Practice by predicting what would happen if the following underwent beta decay: (2
iv. Carbon -10 __________+ _____
v. Cesium-137 __________+ _____
vi. Thorium-234 __________+ _____
Answer:
See explanation and image attached
Explanation:
During beta emission, neutrons are converted into protons and electrons. The anti neutrino balances the spins.
When a nucleus undergoes beta emission, the mass number of the daughter nucleus produced in the process is the same as that of the parent nucleus but the atomic number of the daughter nucleus increases by one unit.
The product of the beta decay of the nuclides shown in the question is described in the image attached to this answer.
What is the function of a lyase enzyme?
a. To assist the substrate by binding to the enzyme, enabling substrate to active site engagement
b. To facilitate a reaction of one substrate to form two products with the use of water
c. To facilitate a reaction of one substrate to form two products without the use of water
d. To tell fibs
Answer:
c. To facilitate a reaction of one substrate to form two products without the use of water
Explanation:
A lyase is an enzyme that catalyzes - accelerates the chemical reaction - in which a substrate is broken into two molecules. The reaction does not involve hydrolysis or oxidation, so the water molecule is not included in the chemical reaction. Thus, the enzyme facilitates the reaction in which a molecule (substrate) is decomposed into two molecules with the elimination of chemical bonds.
Write balanced equations and solubility product expressions for the following compounds
a. CuBr
b. ZnC2O4
c. Ag2CrO4
d. Hg2Cl2
e. AlCl3
f. Mn3(PO4)3
Explanation:
Solubility product is defined as the product of the concentrations or solubilities of the ions each raised to the power their stoichiometric coefficients present in the solution. It is expressed as [tex]K_{sp}[/tex].
(a): CuBr
The chemical equation for the dissociation of CuBr into its ions follows:
[tex]CuBr\rightleftharpoons Cu^++Br^-[/tex]
The expression of [tex]K_{sp}[/tex] for CuBr follows:
[tex]K_{sp}=[Cu^+][Br^-][/tex]
(b): [tex]ZnC_2O_4[/tex]
The chemical equation for the dissociation of [tex]ZnC_2O_4[/tex] into its ions follows:
[tex]ZnC_2O_4\rightleftharpoons Zn^{2+}+C_2O_4^{2-}[/tex]
The expression of [tex]K_{sp}[/tex] for [tex]ZnC_2O_4[/tex] follows:
[tex]K_{sp}=[Zn^{2+}][C_2O_4^{2-}][/tex]
(c): [tex]Ag_2CrO_4[/tex]
The chemical equation for the dissociation of [tex]Ag_2CrO_4[/tex] into its ions follows:
[tex]Ag_2CrO_4\rightleftharpoons 2Ag^{+}+CrO_4^{2-}[/tex]
The expression of [tex]K_{sp}[/tex] for [tex]Ag_2CrO_4[/tex] follows:
[tex]K_{sp}=[Ag^{+}]^2[CrO_4^{2-}][/tex]
(d): [tex]ZnC_2O_4[/tex]
The chemical equation for the dissociation of [tex]Hg_2Cl_2[/tex] into its ions follows:
[tex]Hg_2Cl_2\rightleftharpoons 2Hg^{+}+2Cl^{-}[/tex]
The expression of [tex]K_{sp}[/tex] for [tex]Hg_2Cl_2[/tex] follows:
[tex]K_{sp}=[Hg^{+}]^2[Cl^{-}]^2[/tex]
(e): [tex]AlCl_3[/tex]
The chemical equation for the dissociation of [tex]AlCl_3[/tex] into its ions follows:
[tex]AlCl_3\rightleftharpoons Al^{3+}+3Cl^{-}[/tex]
The expression of [tex]K_{sp}[/tex] for [tex]AlCl_3[/tex] follows:
[tex]K_{sp}=[Al^{3+}][Cl^{-}]^3[/tex]
(f): [tex]ZnC_2O_4[/tex]
The chemical equation for the dissociation of [tex]Mn_3(PO_4)_2[/tex] into its ions follows:
[tex]Mn_3(PO_4)_2\rightleftharpoons 3Mn^{2+}+2PO_4^{3-}[/tex]
The expression of [tex]K_{sp}[/tex] for [tex]Mn_3(PO_4)_2[/tex] follows:
[tex]K_{sp}=[Mn^{2+}]^3[PO_4^{3-}]^2[/tex]
What are the chemical elements in iced tea?
Explanation:
I hope you interested about the chemical what they add in tea
Solid strontium chromate, SrCrO4, dissolves into its respective ions at 25°C. Suppose that in a particular solution, [Sr^2+]=6.0x10^-3M. Find the value of Ksp.
A) 3.6 x 10^-5
B) 6.0 x 10^-3
C) 3.6 x 10^-2
D) 7.7 x 10^-2
Answer:
A) 3.6 x 10^-5.
Explanation:
Hello there!
In this case, according to the given information, it turns out firstly necessary to write the equilibrium expression for the dissociation of strontium chromate:
[tex]Ksp=[Sr^{2+}][CrO_4^{2-}][/tex]
Thus, since strontium and chromate ions are in a 1:1 mole ratio, we can tell the concentration of both ions as the same; and therefore, the Ksp is:
[tex]Ksp=(6.0x10^{-3}M)(6.0x10^{-3}M)\\\\Ksp=3.6x10^{-5}[/tex]
Or option A) 3.6 x 10^-5.
Regards!
The temperature of 10 kg of a substance rises by 55oC when heated. Calculate the temperature rise when 22 kg of the substance is heated with the same quantity of heat.
Answer:
The temperature rise is 25°C
Explanation:
The heat of a substance is obtained using the equation:
Q = m*S*ΔT
Where Q is heat in kJ, m is the mass of the susbtance, S is specific heat of the material and ΔT change in temperature.
Replacing:
Q/S = m*ΔT
As Q is constant because the heat is the same and S is the specific heat of the material (Constant). We can write:
m1*ΔT1 = m2*ΔT2
Where m is mass and ΔT change in temperature of 1, initial conditions of the substance and 2, final conditions of the substance.
Replacing:
m1 = 10kg
ΔT1 = 55°C
m2 = 22kg
ΔT2 = ?
10kg*55°C = 22kg*ΔT2
ΔT2 = 25°C
The temperature rise is 25°C
In what kind of orbitals do the lone-pair electrons on the singly bonded oxygen of methyl acetate reside, and are they in the same plane as the group
Answer:
Both lone pairs reside in sp3 orbitals; they are co-planar with the CH3 group.
Explanation:
In the compound, methyl acetate, the lone-pair of electrons on the singly bonded oxygen atom is accommodated in sp3 hybridized orbitals.
If we look at the compound, we will notice the both lone pair of electrons on oxygen are accommodated in sp3 orbitals which are co-planar with the CH3 group in the molecule.
The atomic particle with a charge of -1.6 x 10-19 C is
Explanation:
Proton +1.60 x 10-19 C 1.672 x 10-24 g
Electron -1.60 x 10-19 C 9.05 x 10-28 g
Neutron neutral 1.674 x 10-24 g
Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 7.40 moles of magnesium perchlorate, Mg(ClO4)2. Express the number of moles of Mg, Cl, and O atoms numerically, separated by commas.
Answer:
Number of moles Magnesium (Mg) = 7.40 moles
Number of moles Chlorine (Cl) = 14.8 moles
Number of moles of oxygen atoms = 29.6 moles
7.40;14.8;29.6
Explanation:
Step 1: Data given
Number of moles of magnesium perchlorate, Mg(ClO4)2 = 7.40 moles
Step 2: Calculate number of moles
In 1 mol of magnesium perchlorate, Mg(ClO4)2, we have:
1 Mol Magnesium (Mg)
2 moles of Chlorine (Cl)
8 moles of oxygen (O)
This means that for 1 mol of magnesium perchlorate, Mg(ClO4)2, we have the same amount of moles Magnesium (Mg), the double amount of moles of Chlorine (Cl) and 4x the amount of moles of oxygen (O)
Number of moles Magnesium (Mg)= 1 * 7.40 moles = 7.40 moles
Number of moles Chlorine (Cl) = 2 * 7.40 moles = 14.8 moles
Number of moles of oxygen atoms = 4 * 7.40 moles = 29.6 moles
7.40;14.8;29.6
How many tons are contained in 825 megagrams?
Answer:909
Explanation:
PLZ Answer ASAP
I need help with this thank you if you get it right
Answer:
A) -277.6 KJ/mol
Explanation:
The enthalpy data for first equation is not given but it should be somewhere around ΔH = –1367 kJ/mol.
So, Basically you want to rearrange the given three equations to match the equation they want you to have. To get the final equation, reverse reaction first reaction (turn its value into positive), multiply second equation by 2, multiply third equation by 3 and you add em all up:
You get 1367 + (2* -393.5) + (3 * -285.8) ~ -277.6 KJ/mol
Which represents the correct equilibrium constant expression for the reaction below?
Answer:
b
Explanation:
because it is products /reactants :)
2Al + 6HCl → 2AlCl3 + 3H2
If 85.0 grams of HCl react, how many moles of H2 are produced?
Answer:
1.17 mol
Explanation:
Step 1: Write the balanced equation
2 Al + 6 HCl → 2 AlCl₃ + 3 H₂
Step 2: Calculate the moles corresponding to 85.0 g of HCl
The molar mass of HCl is 36.46 g/mol.
85.0 g × 1 mol/36.46 g = 2.33 mol
Step 3: Calculate the number of moles of H₂ produced from 2.33 moles of HCl
The molar ratio of HCl to H₂ is 6:3.
2.33 mol HCl × 3 mol H₂/6 mol H₂ = 1.17 mol H₂
Someone plssss help meeee !!!! How much energy is required to vaporize 112 g of water? ???
Answer:
6.05 × 10⁴ cal
Explanation:
Step 1: Given and required data
Mass of water (m): 112 g
Enthalpy of vaporization of water (ΔHvap): 540 cal/g
Step 2: Calculate how much energy is required to vaporize 112 g of water
Vaporization is a physical change in which a substance goes from the liquid state to the gaseous state. We can calculate the energy required (Q) using the following expression.
Q = ΔHvap × m
Q = 540 cal/g × 112 g = 6.05 × 10⁴ cal
If a small amount of a strong base is added to buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA, the pH of the buffer solution does not change appreciably because:__________
a. the K, of HA is changed.
b. No reaction occurs.
c. the strong base reacts with A to give HA, which is a weak acid.
d. the strong base reacts with HA to give AOH and H'.
e. the strong base reacts with HA to give A, which is a weak base,
Answer:
e. the strong base reacts with HA to give A, which is a weak base
Explanation:
Let's consider a buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA. The function is a buffer system is to muffle the change in the pH when an acid or a base is added.
Let's suppose a strong base is added. Then, OH⁻ would be more available. OH⁻ ions react with the acid component of the buffer and its effect is reduced. The corresponding reaction is:
OH⁻ + HA ⇄ A⁻ + H₂O
As we can see, the strong base reacts with HA to give A, which is a weak base.
True or false
Bases will have a relatively high concentration of hydroxide ions and a pH around 10.
Answer:
false
Explanation:
It is because the pH for Hydroxide ions is 7
Answer:
True
Explanation:
Acids have a low concentration of hydroxide ions and a pH of 1-6, while bases have a high concentration of hydroxide ions and a pH of 8-14
Explain why a random copolymer is obtained when 3,3-dimethyl-1-butene undergoes cationic polymerization.
Solution :
In the field of chemistry, the cationic polymerization is a kind of the chain growth polymerization where the cation initiator transfers the charge to the monomer and makes it more reactive. This kind of polymerization reaction is very sensitive to the temperature. With increase in temperature, the molecular weight as well as the reaction rate decreases rapidly.
Thus in the cationic polymerization of the 3,3-dimethyl-1-butene, the carbonation intermediate is formed and it rearranges itself. The attack o the 2nd alkene ca take place both the carbonations, so that random copolymer is formed.
For a particular energy level, removing an electron from the __________ subshell would require a higher first ionization energy.
Answer: For a particular energy level, removing an electron from the s subshell would require a higher first ionization energy.
Explanation:
For a particular energy level, removing an electron from the s- subshell requires higher first ionization energy as the electrons in the s-subshell are tightly held by the nucleus.
What is ionization energy?
Ionization energy is defined as the minimum amount of energy required to remove an electron which is loosely held in the outermost shell to form an isolated gaseous atom,ion or molecule.
It has a positive value for neutral atoms indicating that the ionization process is an endothermic process . The closer the outermost shell electrons are to the nucleus of an atom higher is it's ionization energy.It is expressed in electron volts or joules.
Ionization energy increases across period as more energy is required to remove electron from an atom as it is closely held along a period while it is decreasing down the group as on going the group the inter-nuclear distance increases and as a result less energy is required to remove an electron.
Learn more about ionization energy,here:
https://brainly.com/question/28385102
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1. Make ___________________
Observe an event. State only what we can
________ or ____________.
2. Ask ___________________
Ask a question that helps us find out _______ and _______ the event happened. We must be
able to answer the question with ________, or ________. We may need to __________ our question several times before it is__________.
3. Construct a_____________________
State the answer we think we’ll get when we ask
our question. This is called a
_________________. It’s based on our best
understanding of the event.
4. Test the hypothesis with an
_______________________
Test whether the hypothesis is ___________.
During the investigation, we collect _______ that
answers the testable question we asked.
Answer:
Explanation:
ANCHOR ANCHOR ANCHOR ANCHOR
if The difference in height of mercury in the two arms is 435 mm. What is the pressure of the nitrogen gas in kPa?
Answer:
Therefore, Pnitrogen=97.5kpa
Explanation:
100.0-2.49
=97.5
435= i don't know
Which of the following will increase solubility the rate of the dissolving process of a gaseous solute in solvent? (mark all that apply) please help!
Answer: The increase in solubility or the rate of dissolving process of a gaseous solute in a liquid solvent is due to following:
Increasing agitationIncreasing temperatureIncreasing solute's partial pressure over the solventIncreasing solute's surface areaExplanation:
When agitation is increased then there will occur an increase in kinetic energy of the molecules of a substance. As a result, more number of collisions will take place due to which more amount of solute will dissolve into the solvent.
Similarly, increasing the temperature will further increase the kinetic energy of molecules. Hence, this will lead to more solubility of gaseous solute into the liquid solvent.
As solubility of a gas is directly proportional to the pressure of the gas above surface of the solution. So, an increase in solute's partial pressure over solvent will also lead to an increase in solubility of gaseous solute into liquid solvent.
When surface area of solute is increased then there will be more solute particles available for reaction. Hence, more collisions will take place. As a result, rate of reaction is more due to which there will be an increase in solubility.
Thus, we can conclude that the increase in solubility or the rate of dissolving process of a gaseous solute in a liquid solvent is due to following:
Increasing agitationIncreasing temperatureIncreasing solute's partial pressure over the solventIncreasing solute's surface areaGiven a 0.200 M solution of anserine at its isoelectric point and ready access to 0.100 M HCl, 0.100 M NaOH and distilled water, describe the preparation of 1 L of 0.0400 M anserine buffered solution, pH 7.20.
Solution :
Given :
Amount of anserine solution = 0.200 M
pH value is = 7.20
Preparation of 0.04 M solution of anserine from the 0.2 M solution.
0.2 M x [tex]x[/tex] = 0.04 M x 1000 ml
[tex]x[/tex] = 200 ml
So the 200 ml of 0.2 M anserine solution is required to prepare0.04 M of anserine.
0.1 M x [tex]x[/tex] = 0.04 x 1000 ml
[tex]x[/tex] = 400 ml
Therefore, 400 ml of HCl is needed.
A mixture of sodium hydroxide and strontium hydroxide contains a total of 0.19 moles of the two compounds. It requires 100.0 mL of 2.969 M HCl to neutralize all of the base. How many moles of sodium hydroxide were in the original mixture
Answer:
0.0831 moles of NaOH were in the original mixture
Explanation:
The strontium hydroxide, Sr(OH)2, requires 2 moles of HCl per mole of hydroxide to be neutralized.
The sodium hydroxide, NaOH, requires 1 mol of HCl per mol of hydroxide.
To solve this question we must write 2 equations:
(1) 0.19mol = X + Y
Where X = Moles NaOH; Y = Moles Sr(OH)2
The moles of HCl required are:
0.100L * (2.969mol / L) = 0.2969 moles HCl
0.2969 mol = X + 2Y(2)
Replacing (1) in (2):
0.19mol - Y = X
0.2969 mol = (0.19mol - Y) + 2Y
0.1069mol = Y
Moles X = Moles NaOH:
0.19mol = X + 0.1069mol
X = 0.0831 moles of NaOH were in the original mixture
Density is the ratio of a sample's mass to its volume. A bar of lead has a mass of 115.2 g. When it is submerged in 25.0 mL of water in a graduated cylinder, the water level rises to 35.5 mL. What is the density of the lead
Answer:
[tex]$10.97 \ g/cm^3$[/tex]
Explanation:
Given :
Mass of a bar of lead = 115.2 g
Initial water level [tex]$\text{in the graduated cylinder}$[/tex] = 25 mL
Final water level [tex]$\text{in the graduated cylinder}$[/tex] = 35.5 mL
Difference in the water level = 35.5 - 25
= 10.5 mL
= [tex]10.5 \ cm^3[/tex]
We know that when a body is submerged in water, it displaces its own volume of water.
Therefore, the volume of the lead bar = volume of the water displaced = 10.5 mL = [tex]10.5 \ cm^3[/tex]
We know that mathematically, density is the ratio of mass of body to its volume.
Density of the lead bar is given by :
[tex]$\rho =\frac{\text{mass}}{\text{volume}}$[/tex]
[tex]$\rho =\frac{\text{115.2 g}}{\text{10.5 cm}^3}$[/tex]
= [tex]$10.97 \ g/cm^3$[/tex]